By using first law of thermodynamics, find the change in internal energy during boiling of liquids.

Solution

Let the latent heat of vaporisation of a liquid of mass m at its boiling temperature be L.
Let V_ℓ be the volume of liquid and V_v be the volume of vapours and let evaporation take place at constant pressure P.

According to the first law of thermodynamics,
$space space space space space space space space space space increment straight Q equals increment straight U plus straight P increment straight V space rightwards double arrow space space space space space space mL equals increment straight U plus straight P left parenthesis straight V subscript straight v minus straight V subscript straight ell right parenthesis space rightwards double arrow space space space increment straight U equals mL minus straight P left parenthesis straight V subscript straight v minus straight V subscript straight ell right parenthesis space space$
This is the required expression for change in internal energy.

Some More Questions From Mechanical Properties of Fluids Chapter

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Mechanical Properties Of Fluids

By using first law of thermodynamics, find the change in internal energy during boiling of liquids.

Some More Questions From Mechanical Properties of Fluids Chapter

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.

When two bodies will be said to be in thermal equilibrium?

If two bodies are not in thermal equilibrium, then in which direction the heat will flow?

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