In a static fluid an important property is the pressure in the fluid. Pressure is familiar as a surface force exerted by a fluid against the walls of its container. Also, pressure exists at any point in a volume of a fluid.

In order to understand pressure, which is defined as force exerted per unit area, we must first discuss a basic law of Newton's. This equation for calculation of the force exerted by a mass under the influence of gravity is

Equation 2.2-1

where in SI units F is the force exerted in newtons N (kg · m/s^{2}), m the mass in kg, and g the standard acceleration of gravity, 9.80665 ...

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