Atmospheric Pressure in Bar
The bar is a metric unit of pressureIt is not part of the International System of Units SI. Bar Unit of Pressure.
Pressure
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 101325 kPa 1 atm.
. Atmospheric pressure can be measured with a mercury barometer hence the commonly used synonym barometric pressure which indicates the height of a column of mercury that exactly balances. A torr is 1760 of an atmosphere and a micrometer is 0001 torr. Absolute pressure is the pressure in psia above a perfect vacuum and is equal to atmospheric pressure less negative gauge pressure.
If a pressure gauge is calibrated to read zero in space then at sea level on Earth it would read 147 psi. 100000 bar 18 GPa Pressure needed for the first commercially successful synthesis of diamond. 24 to 110 GPa.
Millibars comes from the original term for pressure bar. Atmospheric pressure on Mars 1 of atmospheric sea-level pressure on Earth. The bar is commonly used in the industry and in the meteorology and an instrument used in meteorology to measure atmospheric pressure is called barometer.
A millibar is 11000th of a bar and is approximately equal to 1000 dynes one dyne is the amount of force it takes to accelerate an object with a mass of one gram at the rate of one centimeter per second squared. 610 Pa 0089 psi Partial vapour pressure at the triple point of water 611657 Pa. One bar is exactly equal to 100 000 Pa and is slightly less than the average.
To calculate atmospheres divide absolute pressure in psia by 147. Bar is from the Greek báros meaning weight. 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.
Other vacuum units are atmospheres torr and micrometers. Atmospheric pressure also called barometric pressure force per unit area exerted by an atmospheric column that is the entire body of air above the specified area. Thus a reading of 30 psig on a tire gauge represents an absolute pressure of 447 psi.
Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure.
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