Pressure 760 mm Hg in pascals. The influence of atmospheric pressure on human health. Atmospheric pressure and temperature

Pressure 760 mm Hg in pascals. The influence of atmospheric pressure on human health. Atmospheric pressure and temperature
Pressure 760 mm Hg in pascals. The influence of atmospheric pressure on human health. Atmospheric pressure and temperature
26.04.2020


Pascal (Pa, Pa)

Bar (bar, bar)- approximately equal to one atmosphere.

One bar is equal to 105 N/m² or 106 dynes/cm² or 0.986923 atm.

Also used millibar

PSI (lb.p.sq.in.)

millimeter of water column inch of mercury (inHg)

Micron (micron,μ )

Pascal Bar Technical atmosphere Physical atmosphere Millimeter of mercury Pound-force per square inch Micron Inch of mercury
(Pa, Pa) (bar, bar) (at, at) (atm, atm) (mmHg, torr, torr) (psi) (μκ, micron) ("Hg, inHg)
1 Pa 1 N m2 10-5 10.197 10-6 9.8692 10-6 7.5006 10-6 145.04 10-6 7,5 29.53 10-5
1 bar 105 1·106 dynes/cm2 1,0197 0,98692 750,06 14,504 7.5 105 2,953
1 at 98066,5 0,980665 1 kgf/cm2 0,96784 735,56 14,223 7.356 105 28,96
1 atm 101325 1,01325 1,033 1 atm 760 14,696 7.6 105 29,9222
1 mmHg 133,322 1.3332·10-3 1.3595 10-3 1.3158 10-3 1 mmHg 19.337 10-3 1000 39.37 10-3
1 psi 6894,76 68.948 10-3 70.307 10-3 68.046 10-3 51,715 1 lbf/in2 5.171 104 0,2036
1 micron 0,1333 1.333 10-6 1.3595 10-6 1.3158 10-6 10-3 19.337 10-6 1 μκ 39.37 10-6
1"Hg 3.386 103 0,33864 34.531 10-3 33.42 10-3 25,4 4,9116 25.4·103 1 inHg

Alexey Matveev,

You will need

  • - calculator;
  • - computer;
  • - Internet.

Instructions



  • When converting pressure to pascals, keep in mind that when measuring blood pressure, in meteorological reports, as well as among vacuum engineers, the name “mmHg” is often abbreviated. Art." to “mm” (sometimes millimeters are also omitted). Therefore, if the pressure is specified in millimeters or just a number, then most likely it is mmHg. Art. (if possible, please clarify). When measuring very low pressures instead of mmHg. Art. "vacuum specialists" use the unit "micron of mercury", which is usually designated as "µm". Accordingly, if the pressure is indicated in microns, then simply divide this number by a thousand and get the pressure in mmHg. Art.
  • When measuring high pressures, the unit “atmosphere” is often used, corresponding to normal atmospheric pressure.

    Millimeter of mercury

    One atmosphere (atm) is equal to 760 mm Hg. Art. That is, to obtain pressure in mmHg. Art. multiply the number of atmospheres by 760. If the pressure is indicated in “technical atmospheres”, then to convert the pressure to mmHg. Art. multiply this number by 735.56.

  • Example.



    505400 Pa (or 505.4 kPa).

CompleteRepair.Ru

When installing an air conditioner, it is necessary to measure the pressure in the system. Pressure gauges use different pressure units, which, in turn, may differ from those indicated in the technical specifications of the air conditioner itself. How to avoid confusion in this diversity?
To help novice installers, a brief description of the different pressure units is provided below.

Pascal (Pa, Pa)- equal to a pressure force of one newton per square meter.

Bar (bar, bar)

Also used millibar(mbar, mbar), 1 mbar = 0.001 bar.

The atmosphere is technical (at, at)- equal to a pressure of 1 kgf per 1 cm².

The atmosphere is standard, physical (atm, atm)- equal to 101,325 Pa and 760 millimeters of mercury.

PSI (lb.p.sq.in.)- pound-force per square inch, lbf/in² is equal to 6,894.75729 Pa.

Millimeter of mercury (mm Hg, mm Hg, torr, Torr)— equal to 133.3223684 Pa. Also used millimeter of water column(1 mmHg = 13.5951 mmH2O) and inch of mercury (inHg).

Millimeter of mercury to pascal

1 inHg = 3.386389 kPa at 0°C.

Micron (micron,μ ) - equal to 0.001 mm Hg. Art. (0.001 Torr).

Conversion table for pressure units:

Pascal Bar Technical atmosphere Physical atmosphere Millimeter of mercury Pound-force per square inch Micron Inch of mercury
(Pa, Pa) (bar, bar) (at, at) (atm, atm) (mmHg, torr, torr) (psi) (μκ, micron) ("Hg, inHg)
1 Pa 1 N m2 10-5 10.197 10-6 9.8692 10-6 7.5006 10-6 145.04 10-6 7,5 29.53 10-5
1 bar 105 1·106 dynes/cm2 1,0197 0,98692 750,06 14,504 7.5 105 2,953
1 at 98066,5 0,980665 1 kgf/cm2 0,96784 735,56 14,223 7.356 105 28,96
1 atm 101325 1,01325 1,033 1 atm 760 14,696 7.6 105 29,9222
1 mmHg 133,322 1.3332·10-3 1.3595 10-3 1.3158 10-3 1 mmHg 19.337 10-3 1000 39.37 10-3
1 psi 6894,76 68.948 10-3 70.307 10-3 68.046 10-3 51,715 1 lbf/in2 5.171 104 0,2036
1 micron 0,1333 1.333 10-6 1.3595 10-6 1.3158 10-6 10-3 19.337 10-6 1 μκ 39.37 10-6
1"Hg 3.386 103 0,33864 34.531 10-3 33.42 10-3 25,4 4,9116 25.4·103 1 inHg

Alexey Matveev,
technical specialist at Raskhodka company

In order to find out how many atmospheres there are in a millimeter of mercury, you need to use a simple online calculator. Enter in the left field the number of millimeters of mercury that you want to convert. In the field on the right you will see the result of the calculation. If you need to convert millimeters of mercury or atmosphere to other units of measurement, simply click on the appropriate link.

What is a “millimeter of mercury”

The off-system unit millimeter of mercury (mm Hg; mm Hg), sometimes called "torr", is equal to 101 325 / 760 ≈ 133.322 368 4 Pa. Atmospheric pressure was measured with a barometer containing a column of mercury, hence the name of this unit of measurement. At sea level, the atmospheric pressure is approximately 760 mmHg. Art. or 101,325 Pa, hence the value is 101,325/760 Pa. This unit is traditionally used in vacuum technology, in measuring blood pressure and in weather reports. In some instruments, measurements are made in millimeters of water column (1 mm Hg = 13.5951 mm water column), and in the USA and Canada there is also “inch of mercury” (inHg) = 3.386389 kPa at 0° C.

What is "atmosphere"

An off-system unit of pressure that approximately corresponds to atmospheric pressure at ocean level. There are equally two units - the technical atmosphere (at, at) and the normal, standard or physical atmosphere (atm, atm). One technical atmosphere is a uniform perpendicular pressure of a force of 1 kgf on a flat surface with an area of ​​1 cm². 1 at = 98,066.5 Pa.

Pressure Calculator

The standard atmosphere is a pressure of a mercury column with a height of 760 mm at a mercury density of 13,595.04 kg/m³ and zero temperature. 1 atm = 101,325 Pa = 1.033233 at. In the Russian Federation, only the technical atmosphere is used.

In the past, the terms "ata" and "ati" were used for absolute and gauge pressure. Excess pressure is the difference between absolute and atmospheric pressure, when absolute pressure is greater than atmospheric pressure. The difference between atmospheric and absolute pressure, when absolute pressure is lower than atmospheric pressure, is called rarefaction (vacuum).

Millimeters of mercury and pascals are used to measure pressure. Although the pascal is an official system unit, non-system millimeters of mercury are in no way inferior to them in their prevalence. “Millimeters” even have their own name – “torr”, given in honor of the famous scientist Torricelli. There is an exact relationship between the two units: 1 mmHg. Art. = 101325 / 760 Pa, which is the definition of the unit “mm Hg.” Art."

You will need

  • - calculator;
  • - computer;
  • - Internet.

Instructions

  • To convert the pressure specified in millimeters of mercury to pascals, multiply the number of mmHg. Art. by the number 101325, and then divide by 760. That is, use a simple formula: Kp = Km * 101325 / 760, where:
    Km – pressure in millimeters of mercury (mm Hg, mm Hg, torr, torr)
    Kp – pressure in pascals (Pa, Pa).
  • Using the above formula gives the closest match between the two measurement systems. For practical calculations, use a simpler formula: Kp = Km * 133.322 or simplified Kp = Km * 133.
  • When converting pressure to pascals, keep in mind that when measuring blood pressure, in meteorological reports, as well as among vacuum engineers, the name “mmHg” is often abbreviated. Art." to “mm” (sometimes millimeters are also omitted). Therefore, if the pressure is specified in millimeters or just a number, then most likely it is mmHg. Art. (if possible, please clarify).

    How to convert Pa to mm. Hg Art.?

    When measuring very low pressures instead of mmHg. Art. "vacuum specialists" use the unit "micron of mercury", which is usually designated as "µm". Accordingly, if the pressure is indicated in microns, then simply divide this number by a thousand and get the pressure in mmHg. Art.

  • When measuring high pressures, the unit “atmosphere” is often used, corresponding to normal atmospheric pressure. One atmosphere (atm) is equal to 760 mm Hg. Art. That is, to obtain pressure in mmHg. Art. multiply the number of atmospheres by 760. If the pressure is indicated in “technical atmospheres”, then to convert the pressure to mmHg. Art. multiply this number by 735.56.
  • Example.
    The pressure in a car tire is 5 atmospheres. What will this pressure be equal to, expressed in pascals? Solution.
    Convert pressure from atmospheres to mmHg. Art.: 5 * 760 = 3800.
    Convert pressure from mm Hg. Art. in pascals: 3800 * 133 = 505400. Answer.
    505400 Pa (or 505.4 kPa).
  • If you have a computer or mobile phone with Internet access, then simply find any online service for converting physical units of measurement. To do this, type in a search engine a phrase like “convert from mmHg to pascals” and use the instructions on the service website.

CompleteRepair.Ru

Converting pascals to millimeters of mercury

When installing an air conditioner, it is necessary to measure the pressure in the system. Pressure gauges use different pressure units, which, in turn, may differ from those indicated in the technical specifications of the air conditioner itself. How to avoid confusion in this diversity?
To help novice installers, a brief description of the different pressure units is provided below.

Pascal (Pa, Pa)- equal to a pressure force of one newton per square meter.

Bar (bar, bar)- approximately equal to one atmosphere. One bar is equal to 105 N/m² or 106 dynes/cm² or 0.986923 atm.

Also used millibar(mbar, mbar), 1 mbar = 0.001 bar.

The atmosphere is technical (at, at)- equal to a pressure of 1 kgf per 1 cm².

The atmosphere is standard, physical (atm, atm)- equal to 101,325 Pa and 760 millimeters of mercury.

PSI (lb.p.sq.in.)- pound-force per square inch, lbf/in² is equal to 6,894.75729 Pa.

Millimeter of mercury (mm Hg, mm Hg, torr, Torr)— equal to 133.3223684 Pa. Also used millimeter of water column(1 mmHg = 13.5951 mmH2O) and inch of mercury (inHg). 1 inHg = 3.386389 kPa at 0°C.

Micron (micron,μ ) - equal to 0.001 mm Hg. Art. (0.001 Torr).

Conversion table for pressure units:

Pascal Bar Technical atmosphere Physical atmosphere Millimeter of mercury Pound-force per square inch Micron Inch of mercury
(Pa, Pa) (bar, bar) (at, at) (atm, atm) (mmHg, torr, torr) (psi) (μκ, micron) ("Hg, inHg)
1 Pa 1 N m2 10-5 10.197 10-6 9.8692 10-6 7.5006 10-6 145.04 10-6 7,5 29.53 10-5
1 bar 105 1·106 dynes/cm2 1,0197 0,98692 750,06 14,504 7.5 105 2,953
1 at 98066,5 0,980665 1 kgf/cm2 0,96784 735,56 14,223 7.356 105 28,96
1 atm 101325 1,01325 1,033 1 atm 760 14,696 7.6 105 29,9222
1 mmHg 133,322 1.3332·10-3 1.3595 10-3 1.3158 10-3 1 mmHg 19.337 10-3 1000 39.37 10-3
1 psi 6894,76 68.948 10-3 70.307 10-3 68.046 10-3 51,715 1 lbf/in2 5.171 104 0,2036
1 micron 0,1333 1.333 10-6 1.3595 10-6 1.3158 10-6 10-3 19.337 10-6 1 μκ 39.37 10-6
1"Hg 3.386 103 0,33864 34.531 10-3 33.42 10-3 25,4 4,9116 25.4·103 1 inHg

Alexey Matveev,
technical specialist at Raskhodka company

About a third of our planet's population reacts sensitively to environmental changes. Most of all, a person’s well-being is influenced by atmospheric pressure - the attraction of air masses to the Earth. What atmospheric pressure is considered normal for a person depends on the area in which he spends the vast majority of the time. Everyone will find their familiar conditions comfortable.

What is atmospheric pressure

The planet is surrounded by an air mass, which, under the influence of gravity, presses on any object, including the human body. The force is called atmospheric pressure. Each square meter is pressed by a column of air weighing approximately 100,000 kg. Atmospheric pressure is measured using a special device - a barometer. It is measured in pascals, millimeters of mercury, millibars, hectopascals, atmospheres.

The normal atmospheric pressure is 760 mm Hg. Art., or 101 325 Pa. The discovery of the phenomenon belongs to the famous physicist Blaise Pascal. The scientist formulated a law: at the same distance from the center of the earth (it doesn’t matter, in the air, at the bottom of a reservoir), the absolute pressure will be the same. He was the first to propose measuring heights using the barometric alignment method.

Atmospheric pressure standards by region

It is impossible to find out what atmospheric pressure is considered normal for a healthy person - there is no definite answer. The impact varies across different regions of the globe. Within a relatively small area, this value can vary noticeably. For example, in Central Asia, slightly elevated numbers are considered standard (on average 715-730 mm Hg). For central Russia, normal atmospheric pressure is 730-770 mm Hg. Art.

Indicators are related to the elevation of the surface above sea level, wind direction, humidity and ambient temperature. Warm air weighs less than cold air. Over an area of ​​high temperature or humidity, the compression of the atmosphere is always less. People living in high mountain areas are not sensitive to such barometer readings. Their body was formed under these conditions, and all organs underwent appropriate adaptation.

How pressure affects people

The ideal value is 760 mmHg. Art. What awaits when the mercury column fluctuates:

  1. A change in optimal indicators (up to 10 mm/h) already leads to a deterioration in well-being.
  2. With a sharp increase or decrease (on average by 1 mm/h), even healthy people experience a significant deterioration in well-being. Headache, nausea, and loss of performance appear.

Meteor dependence

A person’s sensitivity to weather conditions - wind changes, geomagnetic storms - is called weather dependence. The influence of atmospheric pressure has not yet been fully studied. It is known that when weather conditions change, internal tension is created inside the vessels and cavities of the body. Meteorological dependence can be expressed:

  • irritability;
  • pain of various localization;
  • exacerbation of chronic diseases;
  • general deterioration of health;
  • problems with blood vessels.

In most cases, people with the following diseases suffer from weather dependence:

  • respiratory tract diseases;
  • hypo- and hypertension.

Reaction to high blood pressure

A decrease in barometer readings by at least 10 units (770 mm Hg and below) has a negative impact on health. People with long-standing diseases of the cardiovascular and digestive systems are especially affected by weather changes. On such days, doctors recommend reducing physical activity, spending less time on the street, and not abusing heavy foods and alcohol. Among the main reactions:

  • feeling of congestion in the ear canals;
  • decrease in the number of leukocytes in the blood;
  • decreased activity of intestinal motility;
  • dysfunction of the cardiovascular system;
  • poor ability to concentrate.

Reaction to low atmospheric pressure

A decrease in atmospheric compression to 740 mm or less causes opposite shifts in the body. The basis of all unfavorable changes is oxygen starvation. A rarefied air is created, a low percentage of oxygen molecules: it becomes harder to breathe. They arise.

Pascal (Pa, Pa)

Pascal (Pa, Pa) is a unit of pressure in the International System of Units (SI). The unit is named after the French physicist and mathematician Blaise Pascal.

Pascal is equal to the pressure caused by a force equal to one newton (N) uniformly distributed over a surface of one square meter normal to it:

1 pascal (Pa) ≡ 1 N/m²

Multiples are formed using standard SI prefixes:

1 MPa (1 megapascal) = 1000 kPa (1000 kilopascals)

Atmosphere (physical, technical)

Atmosphere is an off-system unit of pressure measurement, approximately equal to atmospheric pressure on the Earth's surface at the level of the World Ocean.

There are two approximately equal units with the same name:

  1. Physical, normal or standard atmosphere (atm, atm) - exactly equal to 101,325 Pa or 760 millimeters of mercury.

    2. Technical atmosphere (at, at, kgf/cm²)- equal to the pressure produced by a force of 1 kgf, directed perpendicularly and uniformly distributed over a flat surface with an area of ​​1 cm² (98,066.5 Pa).

    1 technical atmosphere = 1 kgf/cm² (“kilogram-force per square centimeter”). // 1 kgf = 9.80665 newtons (exact) ≈ 10 N; 1 N ≈ 0.10197162 kgf ≈ 0.1 kgf

In English, kilogram-force is denoted as kgf (kilogram-force) or kp (kilopond) - kilopond, from the Latin pondus, meaning weight.

Notice the difference: not pound (in English “pound”), but pondus.

In practice, they approximately take: 1 MPa = 10 atmospheres, 1 atmosphere = 0.1 MPa.

Bar

A bar (from the Greek βάρος - heaviness) is a non-systemic unit of pressure measurement, approximately equal to one atmosphere. One bar is equal to 105 N/m² (or 0.1 MPa).

Relationships between units of pressure

1 MPa = 10 bar = 10.19716 kgf/cm² = 145.0377 PSI = 9.869233 (physical atm.) = 7500.7 mm Hg.

1 bar = 0.1 MPa = 1.019716 kgf/cm² = 14.50377 PSI = 0.986923 (physical atm.) = 750.07 mm Hg.

1 atm (technical atmosphere) = 1 kgf/cm² (1 kp/cm², 1 kilopond/cm²) = 0.0980665 MPa = 0.98066 bar = 14.223

1 atm (physical atmosphere) = 760 mm Hg = 0.101325 MPa = 1.01325 bar = 1.0333 kgf/cm²

1 mm Hg = 133.32 Pa = 13.5951 mm water column

Volumes of liquids and gases / Volume

1 gl (US) = 3.785 l

1 gl (Imperial) = 4.546 l

1 cu ft = 28.32 l = 0.0283 cubic meters

1 cu in = 16.387 cc

Flow speed

1 l/s = 60 l/min = 3.6 cubic meters/hour = 2.119 cfm

1 l/min = 0.0167 l/s = 0.06 cubic meters/hour = 0.0353 cfm

1 cubic m/hour = 16.667 l/min = 0.2777 l/s = 0.5885 cfm

1 cfm (cubic feet per minute) = 0.47195 l/s = 28.31685 l/min = 1.699011 cubic meters/hour

Throughput / Valve flow characteristics

Flow coefficient (factor) Kv

Flow Factor - Kv

The main parameter of the shut-off and control body is the flow coefficient Kv. The flow coefficient Kv shows the volume of water in cubic meters per hour (cbm/h) at a temperature of 5-30ºC passing through the valve with a pressure loss of 1 bar.

Flow coefficient Cv

Flow Coefficient - Cv

In countries with an inch measurement system, the Cv coefficient is used. It shows how much water in gallons/minute (gpm) at 60ºF flows through a fixture when there is a 1 psi pressure drop across the fixture.

Kinematic viscosity / Viscosity

1 ft = 12 in = 0.3048 m

1 in = 0.0833 ft = 0.0254 m = 25.4 mm

1 m = 3.28083 ft = 39.3699 in

Units of force

1 N = 0.102 kgf = 0.2248 lbf

1 lbf = 0.454 kgf = 4.448 N

1 kgf = 9.80665 N (exactly) ≈ 10 N; 1 N ≈ 0.10197162 kgf ≈ 0.1 kgf

In English, kilogram-force is expressed as kgf (kilogram-force) or kp (kilopond) - kilopond, from the Latin pondus, meaning weight. Please note: not pound (in English “pound”), but pondus.

Units of mass

1 lb = 16 oz = 453.59 g

Moment of force (torque)/Torque

1 kgf. m = 9.81 N. m = 7.233 lbf * ft

Power Units / Power

Some values:

Watt (W, W, 1 W = 1 J/s), horsepower (hp - Russian, hp or HP - English, CV - French, PS - German)

Unit ratio:

In Russia and some other countries 1 hp. (1 PS, 1 CV) = 75 kgf* m/s = 735.4988 W

In the USA, UK and other countries 1 hp = 550 ft*lb/s = 745.6999 W

Temperature

Fahrenheit temperature:

[°F] = [°C] × 9⁄5 + 32

[°F] = [K] × 9⁄5 − 459.67

Temperature in Celsius:

[°C] = [K] − 273.15

[°C] = ([°F] − 32) × 5⁄9

Kelvin temperature:

[K] = [°C] + 273.15

[K] = ([°F] + 459.67) × 5⁄9

Many people are susceptible to changes in the environment. A third of the population is affected by the attraction of air masses to the earth. Atmospheric pressure: the norm for humans, and how deviations from the indicators affect the general well-being of people.

Changes in the weather can affect a person's condition

What atmospheric pressure is considered normal for humans?

Atmospheric pressure is the weight of air that presses on the human body. On average, this is 1.033 kg per 1 cubic cm. That is, 10-15 tons of gas control our mass every minute.

The standard atmospheric pressure is 760 mmHg or 1013.25 mbar. Conditions in which the human body feels comfortable or adapted. In fact, an ideal weather indicator for any inhabitant of the Earth. In reality, everything is different.

Atmospheric pressure is not stable. Its changes are daily and depend on the weather, terrain, sea level, climate and even time of day. The vibrations are not noticeable to humans. For example, at night the mercury rises 1-2 notches higher. Minor changes do not affect the well-being of a healthy person. Changes of 5-10 or more units are painful, and sudden significant jumps are fatal. For comparison: loss of consciousness from altitude sickness occurs when pressure drops by 30 units. That is, at a level of 1000 m above the sea.

The continent and even an individual country can be divided into conventional areas with different average pressure levels. Therefore, the optimal atmospheric pressure for each person is determined by the region of permanent residence.

High air pressure has a negative effect on hypertensive patients

Such weather conditions are generous for strokes and heart attacks.

For people who are vulnerable to the vagaries of nature, doctors advise on such days to stay outside the active work zone and deal with the consequences of weather dependence.

Meteor dependence - what to do?

The movement of mercury by more than one division in 3 hours is a reason for stress in the strong body of a healthy person. Each of us feels such fluctuations in the form of headaches, drowsiness, and fatigue. More than a third of people suffer from weather dependence to varying degrees of severity. In the zone of high sensitivity are populations with diseases of the cardiovascular, nervous and respiratory systems, and elderly people. How to help yourself if a dangerous cyclone is approaching?

15 ways to survive a weather cyclone

There's not a lot of new advice here. It is believed that together they alleviate suffering and teach the correct way of life in case of weather vulnerability:

  1. See your doctor regularly. Consult, discuss, ask for advice in case your health worsens. Always have prescribed medications on hand.
  2. Buy a barometer. It is more productive to track the weather by the movement of the mercury column, rather than by knee pain. This way you will be able to anticipate the approaching cyclone.
  3. Keep an eye on the weather forecast. Forewarned is forearmed.
  4. On the eve of a weather change, get enough sleep and go to bed earlier than usual.
  5. Adjust your sleep schedule. Provide yourself with a full 8 hours of sleep, getting up and falling asleep at the same time. This has a powerful restorative effect.
  6. Meal schedule is equally important. Maintain a balanced diet. Potassium, magnesium and calcium are essential minerals. Ban on overeating.
  7. Take vitamins in a course in spring and autumn.
  8. Fresh air, walks outside - light and regular exercise strengthens the heart.
  9. Don't overexert yourself. Putting off household chores is not as dangerous as weakening the body before a cyclone.
  10. Accumulate favorable emotions. A depressed emotional background fuels the disease, so smile more often.
  11. Clothes made from synthetic threads and fur are harmful due to static current.
  12. Keep folk remedies for relieving symptoms in a list in a visible place. It’s hard to remember a recipe for herbal tea or a compress when your temples are aching.
  13. Office workers in high-rise buildings suffer more often from weather changes. Take time off if possible, or better yet, change jobs.
  14. A long cyclone means discomfort for several days. Is it possible to go to a quiet region? Forward.
  15. Prevention at least a day before the cyclone prepares and strengthens the body. Do not give up!

Don't forget to take vitamins to improve your health

Atmosphere pressure- This is a phenomenon that is absolutely independent of man. Moreover, our body obeys it. What the optimal pressure should be for a person is determined by the region of residence. People with chronic diseases are especially susceptible to weather dependence.

Pressure is a physical quantity that shows the acting force per unit area of ​​a surface perpendicular to this surface.
Pressure is defined as P = F / S, where P is pressure, F is pressure force, S is surface area. From this formula it is clear that pressure depends on the surface area of ​​the body acting with a certain force. The smaller the surface area, the greater the pressure.

The unit of pressure is newton per square meter (N/m2). We can also convert pressure units N/m2 to pascals, units named after the French scientist Blaise Pascal, who developed the so-called Pascal's Law. 1 N/m2 = 1 Pa.

What's happened???

Pressure of gases and liquids - manometer, differential pressure gauge, vacuum gauge, pressure sensor.
Atmospheric pressure - barometer.
Blood pressure - with a tonometer.

And so, once again the pressure is defined as P = F / S. The force in the gravitational field is equal to the weight - F = m * g, where m is the mass of the body; g – free fall acceleration. Then the pressure is
P = m * g / S. Using this formula, you can determine the pressure exerted by the body on the surface. For example, a person to the ground.

Atmospheric pressure decreases with altitude. The dependence of atmospheric pressure on altitude is determined by the barometric formula -
P = Po*exp(- μgh/RT). Where, μ = 0.029 kg/m3 – molecular weight of gas (air); g = 9.81 m/s2 – free fall acceleration; h — ho– difference in altitude above sea level and the accepted altitude at the beginning of the report (h=ho); R = 8.31 - J/mol K – gas constant; Po – atmospheric pressure at the height taken as the reference point; T - temperature in Kelvin.

It has been experimentally established that atmospheric pressure at sea level is approximately 760 mmHg. Art. Standard atmospheric pressure is taken to be 760 mmHg. Art., or 101,325 Pa, hence the definition of a millimeter of mercury 101,325/760 Pa = 133.322,368, i.e. 1 mmHg Art. = 133.322 Pa.

Mercury mercury(Russian Mark: mmHg mmHg

St.; international: mmHg Art.) is a non-systematic pressure measurement unit equal to 101,325/760 ≈ 133.32,368 4 Pa; sometimes called "Thor"(Russian tag - torr, International - Torr) in honor of the evangelists Torricelli.

In the Russian Federation, it is allowed to use a millimeter of mercury as an outsourcing without limitation of the validity period of “medicine, meteorology, aviation”.

The International Organization of Legal Metrology (OIML) in its recommendation applies the millimeter of mercury to units of measurement "that may be provisionally used before the date specified in national regulations, but cannot be determined if they are not used."

The source of this device is connected to the barometer method of measuring atmospheric pressure, in which the pressure is regulated by a column of liquid. Liquid mercury is widely used because it has a very high density (≈13,600 kg/m3), which reduces the required liquid column height and low vapor pressure at room temperature.

Atmospheric pressure at sea is about 760 mm Hg. Standard atmospheric pressure is assumed to be (exactly) 760 mm Hg. Art. Or 101,325 Pa, so the definition of a millimeter of mercury is assumed (101,325/760 Pa). Previously, a slightly different definition was used: the height of the mercury column is 1 mm and the density is 13.5951 x 103 kg / m³ acceleration free fall 9.806 65 m / s².

The difference between these two definitions is 0.000014%.

Pressure: a short history and units of measurement

Millimeters of mercury are used, for example, in vacuum technology, weather reporting and blood pressure measurements. Since vacuum technology often represents pressure measured in millimeters, we simply omit the word "Hg" for the physical transition in micrometer (micron) vacuum systems, usually without "Hg" pressure.

When a vacuum pump reads 25 microns, this is the last vacuum produced by that pump, measured in column microns of mercury. Of course, no one uses a Torricelli meter to measure such low pressures.

To measure low pressure, use other tools such as a McLeod pressure gauge (vacuum gauge).

Sometimes millimeters of water are used (1 mmHg = 13,5951 mm of water.). The United States and Canada also use the "v" measurement unit. Hg" (inHg). 1 inches of mercury = 3386389 kPa at 0°C

pascal
(Well, well) Bar
(bar, bar) Technical atmosphere
(at, at) Physical atmosphere
(atm, atm) Millimeter mercury
(mmHg.).

mm Hg, Torr, Torr) Water meter
(m water, m H2O) Force psi
(Psi)

1 Pa 1 bar 1 na 1 atm 1 mmHg 1 m of water. Art. 1 psi
1 N/m² 10-5 10.197 10-6 9.8692 10-6 7,500 10-3 1.0197 10-4 145.04 10-6
105 1 106 dyne/cm² 1,0197 0,98692 750,06 10197 14,504
98066,5 0.980665 1 kgf/cm² 0,96784 735,56 10 14223
101325 1,01325 1033 1 atm 760 10:33 14,696
133,322 1.3332 10-3 1.3595 10-3 1.3158 10-3 1 mmHg Art. 13.595 10-3 19.337 10-3
9806,65 9 80665 10-2 0,1 0.096784 73556 1 m of water. Art. 1,4223
6894,76 68 948 10-3 70.307 10-3 68,046 10-3 51,715 0,70307 1 lb/in²

see

also [| code]

Notes [| code]

To find out how many millimeters of mercury are in the atmosphere, you need to use a simple web calculator. Enter the number of millimeters of mercury you want to change in the left field. In the field on the right you will see the calculation result.

If you need to convert millimeters to mercury or other atmospheric units, click on the appropriate link.

What is “millimeter mercury”

Additional system millimeter of mercury (mmHg)

R. mmHg Art.), sometimes called "torr", is equal to 101 325/760 ≈ 133 322 368 4 Pa. Atmospheric pressure was measured by a mercury barometer, hence the name of this unit of measurement. At sea level, the atmospheric pressure is approximately 760 mmHg. Art. or 101,325 Pa, so the value is 101,325/760 Pa. This device is traditionally used in vacuum technology, blood pressure measurements and weather reporting.

Unit converter

Some instruments measure millimeters of water (1 mm Hg, V = 13951 mm water, V.), and "Hg" (Hg) = 3.386389 kPa at 0° found in the United States and Canada C .

What is "atmosphere"

A non-systematic pressure measurement unit that approximates atmospheric pressure at global ocean level.

In addition, two units are the technical atmosphere (at, at) and the normal, standard or physical atmosphere (atm, atm). One technical atmosphere is a single perpendicular force of 1 kg force on a flat surface of 1 cm2.

1 at. = 98.066.5 Pa. The standard atmosphere is a 760mm mercury column with a mercury density of 13,595.04 kg/m³ and zero temperature.

1 atm = 101,325 Pa = 1.0323233 at. The Russian Federation uses only the technical atmosphere.

In the past, the terms "ata" and "ati" were used for absolute and gauge pressure. Excessive pressure is the difference between absolute and atmospheric pressure, when the absolute is greater than atmospheric pressure.

The difference between atmospheric and absolute pressure, when the absolute pressure is lower than atmospheric pressure, is called vacuum (vacuum).

The definition of atmospheric pressure is very simple - it is Atmosphere pressure, what is in it and on the surface of the planet. In other words, atmospheric pressure represents the pressure of one column, which is located on top, with an area of ​​1 square meter.

Atmospheric pressure measurement

Pressure units are pascals, rods and millimeters of mercury. The latter is used in barometers (special measuring instruments) and is understandable to ordinary people, since many people use barometers.

Many people know that 760 mm of mercury normal pressure(this is the atmospheric pressure at sea, since it is accepted as the norm). Just to add that this is normal at 0°C.
Another popular unit of measurement that is often used in physics is the pascal. The value of 101325 Pa is called normal pressure and corresponds to 760 mm of mercury.
Well, the last unit of measurement is the bat.

1 bar = 100,000 Pa. In this case, the normal pressure is 1.01325 bar.

Has anyone heard the expression one atmosphere or three atmospheres, for example?

Mercury mercury

Thus, the atmosphere in this case is called normal pressure (which we discussed above). But pressure equal to three atmospheres cannot be called normal, since it is three times higher than normal.

To simplify the calculation, in the chemistry concept standard atmospheric pressure.

This is almost the same as normal - 100,000 Pa (100 kPa) or 1 bar.

Man is far from being the king of nature, but her child, an integral part of the universe. We live in a world where everything is strictly interconnected and subordinated to one single system.

Everyone knows that the Earth is surrounded by a dense air mass, which is usually called the atmosphere. And on every object, including the human body, it “compresses” an air column that has a certain weight. Scientists have experimentally discovered that every square centimeter of the human body is affected by atmospheric pressure weighing 1033 kilograms.

And if you do some simple math, it turns out that the average person is under 15,550 kg of pressure.

The weight is enormous, but fortunately it is completely insensitive. This may be due to the fact that dissolved oxygen exists in human blood.
What is the effect of atmospheric pressure on humans? A little more about this.

Atmospheric pressure standard


Doctors who talk about what atmospheric pressure is considered normal show a range of 750 ... 760 mm Hg.

This distribution is quite acceptable, since the planet’s topography is not entirely uniform.

Meteorological dependence

Doctors say that some people's bodies can adapt to all conditions.

Even such serious tests as long-distance flights from one climate zone to another are not at all for them.

At the same time, others confined to their homes sense a weather change approaching. This can occur in the form of severe headaches, unexplained weakness, or constantly clammy hands, for example.

These people are more likely to have vascular and endocrine disorders than others.

It is especially difficult if the atmospheric pressure changes sharply in a short time. According to statistics, the majority of people whose bodies react so strongly to changes in atmospheric pressure are women living in large cities.

Unfortunately, the harsh rhythm of life, overcrowding, and the environment are not the best for health.

If you want, you can get rid of addiction. Just keep going and always have to be. The methods are known to everyone. This is the basis of a healthy lifestyle: training, swimming, walking, running, healthy eating, adequate sleep, eliminating bad habits, weight loss.

How does our body react to increased atmospheric pressure?

Atmospheric pressure (standard for humans) is an ideal 760 mmHg. But this indicator is very rare.

Due to the increase in atmospheric pressure, clear weather conditions, there are no sudden changes in humidity and air temperature. Such changes actively respond to hypertension and allergies in the body.

In a situation in the city, without wind, it is natural to pollute the gas.

Firstly, patients with respiratory diseases.

Increasing atmospheric pressure also affects immunity.

Conversion of millimeters of mercury into the atmosphere

This is reflected in a decrease in leukocytes in the blood. A weakened body will not easily control infections.

Doctors advise:

Start your day with light morning exercises. Take a contrast shower. For breakfast, give priority to foods that contain a lot of potassium (cottage cheese, raisins, dried apricots, bananas). Do not allow any more food.

Do not eat. This day is not the most successful for great physical effort and emotions. When you get home, take a break from one hour, do your usual homework, leave early.

Low atmospheric pressure and good health

Low atmospheric pressure, that's how much? You can answer a conditional question if the barometer data is less than 750 mm.st. But it all depends on the region of residence.

Especially for Moscow, the numbers are 748-749 mm Hg. are the norm.

Among the first, I think this is a deviation from the norm of the “core” and those with intracranial pressure. Complaints in general include nausea, frequent migraines, lack of oxygen, difficulty breathing and pain in the intestines.

Doctors advise:

Get your blood pressure back to normal.

Reduce physical activity. Every working hour brings ten minutes of rest. Drink fluids more often, prefer green tea with honey. Drink your morning coffee. Take the herbal tinctures shown for sails. Relax in the evening under a contrast shower. Go to bed before your usual hour.

How Humidity Changes Affect Your Body

Low humidity of 30-40% is not beneficial. This irritates the nasal mucosa. Firstly, these abnormalities are the first, asthma and allergies.

To help in this case, the mucous membrane of the nosopharynx can be moistened with a slightly saline aqueous solution.

Frequent precipitation, of course, increases air humidity to 70-90 percent. This also has a negative impact on health.
High humidity can worsen chronic kidney and joint diseases.

Doctors advise:

If possible, change the climate to a dry one. Reduce retention time in wet weather. Go out for a walk in warm clothes. Remember the vitamins

Atmospheric pressure and temperature

The optimal temperature for a person in a room is not higher than +18.

This is especially true in the bedroom.

How does the interaction between atmospheric pressure and oxygen develop?

If the air temperature rises and the atmospheric pressure decreases at the same time, people suffering from diseases, cardiovascular and respiratory organs suffer.

If the temperature decreases and the atmospheric pressure increases, it becomes bad for hypertensives, asthmatics and patients with stomach and genitourinary problems.

In the event of sudden and multiple temperature fluctuations, an unbearably large amount of histamine, the main pathogen that causes allergies, is formed in the body.

Good to know

What is normal atmospheric pressure for the person you know now?

This is 760 mmHg. Art., But such barometers are very rare.

It is also important to know that the change in atmospheric pressure with altitude (with a rapid decrease) is quite dramatic. Because of this difference, a person who climbs a mountain quickly may lose consciousness.

In Russia, atmospheric pressure is measured in mm Hg. Art. But the international system has its own unit of measurement, the pascal.

At the same time, normal atmospheric pressure in pascals will be 100 kPa. If you convert our 760 mm Hg. in Pascal, normal atmospheric pressure in Pascals for our country will be 101.3 kPa.