# What Units Are Used to Measure Air Pressure?

Air pressure or atmospheric pressure is measured using an instrument known as a barometer, which is also used in forecasting the weather and determining the altitude. Air pressure or atmospheric pressure is the force of each unit area exerted against a surface by the air density above that surface.
Atmospheric pressure or air pressure is measured by a barometer. A mercury barometer measures the pressure by noting the length of mercury which is supported by the weight of the atmosphere.
Pressure is force per unit area. Pressure is measured in various units. Standard unit for air pressure is mm of Hg. Bar is also another unit for the pressure.
Q&A Related to "What Units Are Used to Measure Air Pressure?"
 Air pressure is measured using a barometer, in millibars.PSI is common air pressure measure.Air pressure is also called as barometric pressure as barometers are used to measure barometric http://answers.ask.com/Science/Physics/how_to_meas...
 it is the "weight" that the air has, or the downward pressure it exerts on a surface, and can vary based on altitude above sea level, as well as temperature. It is measured http://wiki.answers.com/Q/What_measurement_is_air_...
 1. Remove the user from the bed. The body weight of someone on the mattress adds to the internal pressure and results in an inaccurate reading. 2. Examine the control unit for the http://www.ehow.com/how_12151032_measure-pressure-...
 It's measured in "PSIs" http://www.chacha.com/question/what-is-air-pressur...
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Air pressure is measured with a barometer, and lots of weather men used the barometer to predict the weather conditions in your area of the world. ...
Air pressure is the amount of pressure that air exerts upon a certain area or region. Changes in air pressure are measured using an instrument called a barometer ...
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