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A pressure of 1 atm can also be stated as: ≈ 1.033 kgf/cm 2 ≈ 10.33 m H 2 O [5] ≈ 760 mmHg [6] ≈ 29.92 inHg [6] ≈ 406.782 in H 2 O [5] ≈ 2 116.22 pounds-force per square foot (lbf/ft 2) The notation ata has been used to indicate an absolute pressure measured in either standard atmospheres (atm) [7] [better source needed] or ...
Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, [1] 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. [2]
1 mmHg = 1.000 000 142 466 321... Torr The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%).
The millimetre of mercury is defined as the pressure exerted by a column of mercury 1 millimetre high with a density of 13 595.1 kg/m 3 (approximate density at 0 °C or 32 °F) at standard gravity (9.806 65 m/s 2), i.e. precisely 133.322 387 415 pascals. 1 mmHg = 1 mm × 13 595.1 kg/m 3 × 9.806 65 m/s 2 = 133.322 387 415 Pa (exactly)
760 mmHg = 1 atm; 1 atm = 1 013 mbar or hPa; 1 mbar or hPa = 0.7502467 mmHg; 1 pascal = 1 Newton per square metre (SI unit) 1 hectopascal is 100 pascals Additional images
For example, IUPAC has, since 1982, defined standard reference conditions as being 0 °C and 100 kPa (1 bar), in contrast to its old standard of 0 °C and 101.325 kPa (1 atm). [2] The new value is the mean atmospheric pressure at an altitude of about 112 metres, which is closer to the worldwide median altitude of human habitation (194 m).
Blood pressure fluctuation (40 mmHg) between heartbeats for a typical healthy adult [44] [45] 6.3 kPa 0.9 psi Pressure where water boils at normal human body temperature (37 °C), the pressure below which humans absolutely cannot survive (Armstrong limit) [46] +9.8 kPa +1.4 psi Lung pressure that a typical person can exert (74 mmHg) [47] 10 4 Pa
A torr was originally defined as 1 mmHg. The pressure is quoted as the level of the mercury's height in the vertical column. Typically, atmospheric pressure is measured between 26.5 inches (670 mm) and 31.5 inches (800 mm) of Hg. One atmosphere (1 atm) is equivalent to 29.92 inches (760 mm) of mercury.