FLUIDS AND PRESSURE

PRESSURE IN FLUIDS

Pressure is defined as force per unit area. It is usually more convenient to use pressure rather than force to describe the influences upon fluid behavior. The standard unit for pressure is the Pascal, which is a Newton per square meter.

Pressure in a fluid may be considered to be a measure of energy per unit volume or energy density. For a force exerted on a fluid, this can be seen from the definition of pressure.


FLUID POTENTIAL ENERGY

The potential energy of a moving fluid is more useful in applications like the Bernoulli  equation when is expressed as potential energy per unit volume
The energy density of a fluid can be expressed in terms of this potential energy density along with kinetic energy density and fluid pressure.

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