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Thermodynamics

In which of the following conditions, is work done on the gas?

$\begin {array} {1 1} (A)\;\text{gas expands against an external pressure} & \quad (B)\;\text{gas is compressed} \\ (C)\;\text{gas expands into vacuum} & \quad (D)\;\text{an ideal gas expands reversibly and isothermally} \end {array}$

A) When a gas expands against the external pressure P in an irreversible manner, work is done by the gas
B) When gas is compressed, work is done on the gas
C) When gas expands into vacuum, no work is done
D) In this case, work done by the gas is maximum
Ans : (B)