# Total Energy of a Liquid | Pressure, Kinetic, Potential Energy – Hydrodynamics

## Total Energy of a Liquid | Pressure, Kinetic, Potential Energy – Hydrodynamics

We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.

Energy of a Liquid
A liquid in motion possess three types of energy
(i) Pressure Energy
Pressure energy per unit mass

= $$\frac{p}{\rho}$$

where, p = pressure of the liquid
and ρ = density of the liquid.
Pressure energy per unit volume = p

Pressure Energy SI Unit
SI unit of pressure energy is Joule(J).

(ii) Kinetic Energy
Kinetic energy per unit mass

= $$\frac{1}{2}$$ v²

Kinetic energy per unit volume

= $$\frac{1}{2}$$ ρv²

Kinetic Energy Units:
The SI unit of kinetic energy is Joule
The CGS unit of kinetic energy is erg.

(iii) Potential Energy
Potential energy per unit mass =gh
Potential energy per unit volume = ρgh

Potential Energy Unit:
The SI unit of kinetic energy is Joule.

Hydrodynamics:
In physics, hydrodynamics of fluid dynamics explains the mechanism of fluid such as flow of liquids and gases. It has a wide range of applications such as evaluating forces and momentum on aircraft, prediction of weather, etc.