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### Definition

Pressure is a measure up of the force versus a surface. Push is generally expressed as a pressure per unit area.

You are watching: How many psi are in 1 atm

Here is a comfortable conversion calculator because that some common pressure terms. The meanings of each term room in the adhering to section.

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 Pressure conversion Calculator(Enter number ~ above the left side; answer appears on the best side) This many: pounds per square inchatmospherestorrbarmillibarpascalskilopascalsmegapascalsgigapascals Equals pounds every square inchatmospherestorrbarmillibarpascalskilopascalsmegapascalsgigapascals

Many the the items girlfriend will discover on one MSDS come in both English (U.S. Customary System) and also metric (International device or SI or cgs) units. The metric system has actually been adopted by virtually every country except the joined States. Also in the U.S., scientists and technical world use the metric system since of its lull of use.

If you are unfamiliar through the terms provided in this definitions, watch our mass unit and also distance unit switch pages.

Pounds every square inch(psi, PSI, lb/in2, lb/sq in)Commonly provided in the U.S., however not elsewhere. Regular atmospheric pressure is 14.7 psi, which means that a tower of air one square inch in area increasing from the Earth"s atmosphere 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 top top the initial Torricelli barometer design, one environment of press will pressure the pillar of mercury (Hg) in a mercury barometer come a height of 760 millimeters. A pressure that causes the Hg tower to climb 1 millimeter is called a torr (you might still check out the ax 1 mm Hg used; this has actually been changed by the torr. "mm Hg" is commonly used because that blood pressure measurements). 1 atm = 760 torr = 14.7 psi.
Bar(bar)The bar nearly identical to the environment unit. One bar = 750.062 torr = 0.9869 atm = 100,000 Pa.
Millibar(mb or mbar)There are 1,000 millibar in one bar. This unit is offered by meteorologists who uncover it easier to describe atmospheric pressures without utilizing decimals. One millibar = 0.001 bar = 0.750 torr = 100 Pa.
Pascal(Pa)1 pascal = a force of 1 Newton every square meter (1 Newton = the pressure required to advice 1 kilogram one meter per 2nd per 2nd = 1 kg.m/s2; this is actually rather logical for 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" means "1,000", so one kilopascal = 1,000 Pa. Therefore, 101.325 kPa = 1 atm = 760 torr and also 100 kPa = 1 bar = 750 torr.
Megapascal(MPa)The prefix "mega" way "1,000,000", therefore one megapascal = 1,000 kPa = 1,000,000 Pa = 9.869 atm = 145 psi.
Gigapascal(GPa)The prefix "giga" means "1,000,000,000", so one gigapascal = 1,000 MPa = 1,000,000 kPa = 1,000,000,000 Pa = 9,870 atm = 10,000 bar. Pressures of several gigapascals can convert graphite come diamond or make hydrogen a metallic conductor! together high pressure are hardly ever encountered in everyday life.
Some worked Examples

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

### SDS Relevance

Be an extremely careful to note the units once reading number on a safety and security Data Sheet. If you ever perform a calculation of any kind of sort, always remember to write the units alongside each number in her calculation and also make certain that castle cancel properly. If castle don"t, your calculation to be incorrect!