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Chapter: 11th Physics : Properties of Matter

Pressure, kinetic and potential energy of liquids

A liquid in a steady flow can possess three kinds of energy. They are (1) Kinetic energy, (2) Potential energy, and (3) Pressure energy, respectively.

Pressure, kinetic and potential energy of liquids

 

A liquid in a steady flow can possess three kinds of energy. They are (1) Kinetic energy, (2) Potential energy, and (3) Pressure energy, respectively.

 

i) Kinetic energy:  The kinetic energy of a liquid of mass m moving with a velocity is given by


The kinetic energy per unit mass =


Similarly, the kinetic energy per unit volume


 

ii) Potential energy: The potential energy of a liquid of mass m at a height h above the ground level is given by

PE = mgh

The potential energy per unit mass


Similarly, the potential energy per unit volume =


 

ii) Pressure energy: The energy acquired by a fluid by applying pressure on the fluid. We know that

Pressure = Force/Area  Force = Pressure × Area

F × d = (P A) × d = P (A × d)

F × d = W = P V = pressure energy

Therefore, pressure energy, EP = PV The pressure energy per unit mass =


Similarly,  the  potential  energy  per  unit volume =


 


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