Pressure Definition: Pressure is a measure of the force
applied over a unit area. Pressure often is expressed in units of
pascals or pounds per square inch. In equations, pressure is denoted by
the symbol 'P'.
Pressure (symbol: p or P) is the ratio of force to the area over which that force is distributed.
Pressure is force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure (also spelled gage pressure)
is the pressure relative to the local atmospheric or ambient pressure.
Pressure is measured in any unit of force divided by any unit of area.
The SI unit of pressure is the newton per square metre, which is called the pascal (Pa) after the seventeenth-century philosopher and scientist Blaise Pascal.
A pressure of 1 Pa is small; it approximately equals the pressure
exerted by a dollar bill resting flat on a table. Everyday pressures are
often stated in kilopascals (1 kPa = 1000 Pa).
