balloon is filled with air and initially occupies a volume of 10 cm3 at a pressure of 150 kPa and temperature of 20o C. The balloon is then moved to warmer environment of 40o C and comes into thermal equilibrium with a final volume of 10.5 cm3 . Assuming ideal gas behavior and a polytropic process for the air (Pvn = constant) then determine the: a) work done by the air (J), b) heat transfer to the air (J).