Web Definition: Pressure
Pressure is a measure of force per unit area. where p is the pressure F is the force A is the area Often F is taken to be the of the magnitude of the mean vector force normal to the surface of area A upon which it exerts; the surface not necessarily being a that of a body, but for example the cross sectional area of a conduit. Pressure is a scalar quantity, but teachers & authors do not appear to believe this in their hearts. The SI unit for pressure is the pascal, equal to one newton per square metre. p is the pressure, measured in pascals F is the force, measured in newtons A is the area, measured in square metres Non-SI measures include the pound-force per square inch & the bar. The cgs unit of pressure is barye. It is equal to 1 dyn·cm -2. Pressure is still sometimes expressed in kg·cm -2 or g·cm -2, but this notation is dimensionally incorrect; kg & g are units of mass, while such pressure readings are actually referring to kilograms- force & grams-force respectively. In the United States air pressure is still measured in inHg — inches of mercury.
Read More »Dictionary Entry: The act of pressing, or the condition of being pressed - compression - a squeezing - a crushing - as, a pressure of the hand.
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