Volume decreases, so work done by gas is negative two equal parts A and B. Part A has an ideal

gas at pressure P 0 and temperature T 0 and in part B is vacuum. A massless spring of force constant k is connected with piston and the wall of the container as shown. Initially spring is unstretched. Gas in chamber A is allowed to expand. Let in equilibrium spring is compressed by x 0 . Then –

final pressure of the gas is

work done by the gas is

change in internal energy of the gas is

temperature of the gas is decreased