Atmospheric Pressure
Atmospheric Pressure (pronounced: /æt.məˈsfɪr.ɪk ˈprɛʃ.ər/) is the force per unit area exerted against a surface by the weight of the air above that surface in the Earth's atmosphere.
Etymology
The term "Atmospheric Pressure" is derived from the Greek words 'atmos' meaning vapor and 'sphaira' meaning sphere, combined with the Latin word 'pressura' meaning pressing hard.
Definition
Atmospheric Pressure is defined as the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.696 psi).
Measurement
Atmospheric pressure is typically measured with a barometer. In meteorology, atmospheric pressure is often described in millibar or in inches (in terms of the height of a column of mercury).
Related Terms
- Barometer: An instrument used to measure atmospheric pressure.
- Atmosphere: The layer of gases surrounding the Earth.
- Pascal: The unit of pressure in the International System of Units (SI).
- Meteorology: The scientific study of the atmosphere and its phenomena, especially in relation to weather and weather forecasting.
See Also
External links
- Medical encyclopedia article on Atmospheric Pressure
- Wikipedia's article - Atmospheric Pressure
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