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Mechanical Properties of Fluids
Question
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What do you mean by the internal energy of the system?

Answer

The internal energy of a system is the total energy possessed by the system due to molecular motion and molecular configuration. 
Internal energy in Thermodynamics is the total amount of energy contained within the whole system. The total energy includes the kinetic energy and potential energy. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What are the units of heat capacity?

Define Dulong and Pettit’s law of specific heat.

Who explained the correct variation of specific heat with temperature in the lower range of temperature?

Do the gases have only one value of specific heat?

What is thermometry?

Define temperature.