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### Definition

Pressure is a measure of the force against a surface. Press is generally expressed together a force per unit area.

You are watching: An instrument used to atmospheric pressure is called a

Here is a handy conversion calculator because that some usual pressure terms. The meanings of every term room in the adhering to section.

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 Pressure counter Calculator(Enter number ~ above the left side; answer shows up on the appropriate side) This many: pounds per square inchatmospherestorrbarmillibarpascalskilopascalsmegapascalsgigapascals Equals pounds per square inchatmospherestorrbarmillibarpascalskilopascalsmegapascalsgigapascals

Many of the items you will find on an MSDS come in both English (U.S. Customary System) and metric (International mechanism or SI or cgs) units. The metric system has actually been embraced by nearly every country except the joined States. Even in the U.S., scientists and technical people use the metric system because of its lull of use.

If you room unfamiliar v the terms used in these definitions, see our massive unit and distance unit switch pages.

Pounds every square inch(psi, PSI, lb/in2, lb/sq in)Commonly supplied in the U.S., but not elsewhere. Typical atmospheric push is 14.7 psi, which method that a column of wait one square customs in area climbing from the Earth"s setting to an are weighs 14.7 pounds.
Atmosphere(atm)Normal atmospheric pressure is characterized as 1 atmosphere. 1 atm = 14.6956 psi = 760 torr.
Torr(torr)Based on the original Torricelli barometer design, one atmosphere of pressure will force the tower of mercury (Hg) in a mercury barometer come a elevation of 760 millimeters. A press that reasons the Hg obelisk to rise 1 millimeter is called a torr (you might still see the term 1 mm Hg used; this has been replaced by the torr. "mm Hg" is generally used for blood press measurements). 1 atm = 760 torr = 14.7 psi.
Bar(bar)The bar practically identical to the environment unit. One bar = 750.062 torr = 0.9869 atm = 100,000 Pa.
Millibar(mb or mbar)There room 1,000 millibar in one bar. This unit is offered by meteorologists who uncover it less complicated to refer to atmospheric pressure without making use of decimals. One millibar = 0.001 bar = 0.750 torr = 100 Pa.
Pascal(Pa)1 pascal = a pressure of 1 Newton per square meter (1 Newton = the pressure required to advice 1 kilogram one meter per second per 2nd = 1 kg.m/s2; this is actually rather logical because that physicists and engineers, honest). 1 pascal = 10 dyne/cm2 = 0.01 mbar. 1 atm = 101,325 Pascals = 760 mm Hg = 760 torr = 14.7 psi.Kilopascal(kPa)The prefix "kilo" way "1,000", so one kilopascal = 1,000 Pa. Therefore, 101.325 kPa = 1 atm = 760 torr and 100 kPa = 1 bar = 750 torr.
Megapascal(MPa)The prefix "mega" means "1,000,000", therefore one megapascal = 1,000 kPa = 1,000,000 Pa = 9.869 atm = 145 psi.
Gigapascal(GPa)The prefix "giga" method "1,000,000,000", therefore one gigapascal = 1,000 MPa = 1,000,000 kPa = 1,000,000,000 Pa = 9,870 atm = 10,000 bar. Pressure of numerous gigapascals can transform graphite come diamond or make hydrogen a metallic conductor! together high pressure are rarely encountered in day-to-day life.
Some functioned Examples

CORRECT: transform 5 atm come psi: WRONG: convert 5 atm come psi: CORRECT: convert 4,000 pascal to torr:  Safety Emporium has gas cylinder signs, racks, carts, clamps, lockouts and an ext to ensure your workers" safety.

### SDS Relevance

Be very careful to keep in mind the units when reading number on a security Data Sheet. If you ever before perform a calculation of any sort, constantly remember to compose the units alongside each number in her calculation and also make sure that lock cancel properly. If they don"t, her calculation to be incorrect!