Which one of the following phenomenon
occurs when gas in a piston cylinder assembly expands reversibly at constant
pressure?
Heat is added to the gas
Heat is removed from the
gas
Gas does work from its own
stored energy
Gas undergoes adiabatic
expansion
Heat is added to the gas
The atmospheric/ ambient pressure ’Patm’ is acting on the
piston. If the cylinder is placed in contact with as hot body (having
temperature infinitesimally more than temperature of gas), energy flows into
the system and the gas expands. This is the system which undergoes reversible
isobaric process. Therefore, here heat is added to the gas.
Hence, the correct option is (A).
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