Air pressure
Air Pressure
Air pressure (pronunciation: /ɛər ˈprɛʃər/), also known as atmospheric pressure, is the force exerted by the weight of the air in the atmosphere of Earth.
Etymology
The term "air pressure" is derived from the Middle English "air", from Old French "air", from Latin "aer", from Greek "aēr" meaning "air" and the Middle English "pressure", from Late Latin "pressura", from Latin "pressus", past participle of "premere" to press.
Definition
Air pressure is defined as the force exerted on a surface by the weight of the air above it. It is measured in units of force per unit area, typically in millibars (mb) or pascals (Pa).
Related Terms
- Barometer: An instrument used to measure air pressure.
- Atmosphere (unit): A unit of pressure defined as 101325 Pa.
- Pressure gradient: The rate of increase or decrease in air pressure.
- High pressure area: A region where the atmospheric pressure at the surface of the planet is greater than its surrounding environment.
- Low pressure area: A region where the atmospheric pressure is lower than its surrounding environment.
See Also
External links
- Medical encyclopedia article on Air pressure
- Wikipedia's article - Air pressure
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