Solve the below problem:
Q: A piston-cylinder device contains 3 ft3 of air at 60 psia and 150°F. Heat is transferred to the air in the amount of 40 Btu as the air expands isothermally. Determine the amount of boundary work done during this process. You must solve the given problem in a steps.You need to include all the units which are needed to complete the problem.