Pressure (symbol: p or P) is the force per unit area applied to an object in a direction perpendicular to the surface. Gauge
pressure is the pressure relative to the local atmospheric or ambient pressure. Pressure is an effect which occurs when a
force is applied on a surface.
p is the pressure,
F is the normal force,
A is the area.
Pressure is a scalar quantity, and has SI units of pascals; 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 sections of fluid normal to these boundaries or sections at
every point. It is a fundamental parameter in thermodynamics and it is conjugate to volume.
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