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  4. For an isothermal process, I. pressure of a given mass of a gas varies inversely as its volume. II. during expansion of gas, work is done by the gas on environment. III. during compression heat is released. Choose the correct statement.

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Q. For an isothermal process,
I. pressure of a given mass of a gas varies inversely as its volume.
II. during expansion of gas, work is done by the gas on environment.
III. during compression heat is released.
Choose the correct statement.

Thermodynamics

Solution:

For an isothermal process, temperature is fixed, so the ideal gas equation is given by $p V=$ constant.
i.e. pressure of a given mass of gas varies inversely as its volume.
In an isothermal expansion, gas absorbs heat and does work on the environment.
In an isothermal compression, work is done on the gas by the environment and heat is released.
So, all statements are correct.