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'''Pressure''' (symbol: P) is the [[force]] per unit area applied in a direction [[perpendicular]] to the surface of an object. [http://en.wikipedia.org/wiki/Gauge_pressure Gauge pressure] is the pressure [[relative]] to the local atmospheric or ambient pressure.
==Definition==
Pressure is an effect which occurs when a [[force]] is applied on a [[surface]]. Pressure is the amount of force [[acting]] on a unit area. The symbol of pressure is P.[1][2]
[[File:Pressureformula.jpg]]
Pressure is a [http://en.wikipedia.org/wiki/Tensor tensor] [[quantity]], and has SI units of pascal; 1 Pa = 1 N/m2, and has EES units of psi; 1 psi = 1 lb/in2.
Pressure is [[transmitted]] to solid boundaries or across [[arbitrary]] [[Fraction|sections]] of [[fluid]] [[normal]] to these boundaries or sections at every point. It is a fundamental [[parameter]] in [http://en.wikipedia.org/wiki/Thermodynamics thermodynamics] and it is conjugate to volume.[http://en.wikipedia.org/wiki/Pressure]
[[Category: General Reference]]
'''Pressure''' (symbol: P) is the [[force]] per unit area applied in a direction [[perpendicular]] to the surface of an object. [http://en.wikipedia.org/wiki/Gauge_pressure Gauge pressure] is the pressure [[relative]] to the local atmospheric or ambient pressure.
==Definition==
Pressure is an effect which occurs when a [[force]] is applied on a [[surface]]. Pressure is the amount of force [[acting]] on a unit area. The symbol of pressure is P.[1][2]
[[File:Pressureformula.jpg]]
Pressure is a [http://en.wikipedia.org/wiki/Tensor tensor] [[quantity]], and has SI units of pascal; 1 Pa = 1 N/m2, and has EES units of psi; 1 psi = 1 lb/in2.
Pressure is [[transmitted]] to solid boundaries or across [[arbitrary]] [[Fraction|sections]] of [[fluid]] [[normal]] to these boundaries or sections at every point. It is a fundamental [[parameter]] in [http://en.wikipedia.org/wiki/Thermodynamics thermodynamics] and it is conjugate to volume.[http://en.wikipedia.org/wiki/Pressure]
[[Category: General Reference]]
