Question

. A rigid tank contains air at 500 kPa and 150 degree C. As a result of heat transfer to the surroundings, the temperature and pressure inside the tank drop to 65 degree C and 400 kPa respectively. Determine the boundary work done during the process

Answer 1

$P_1=500KPa\\T_1=150°C\\P_2=400KPa\\T_2=65°C$

Then work done $=\int PdV$

Isochoric process

$dV=0$

Then

Work done =zero