Air at 450 kPa and 20°C fills a piston–cylinder assembly to a volume of 0.075 m 3 . The air expands, in a constant-temperature process, until the pressure is 150 kPa. (The constanttemperature process...

Air at 450 kPa and 20°C fills a piston–cylinder assembly to a volume of 0.075 m³. The air expands, in a constant-temperature process, until the pressure is 150 kPa. (The constanttemperature process with a gas can be modeled as a polytropic process with
n
= 1.) Determine the work done by the air as it expands.