1. The problem statement, all variables and given/known data The tires on a bicycle require an air pressure of 80 psig. When isothermally pumped up the bicycle tires, the volume of the air (that was originally in the atmosphere) is reduced by a factor of 5.7. Please determine the work that must be done on each lbm of air that is pumped into the tires. Please report your answer in lbf-ft/lbm. . 2. Relevant equations W=nRT*ln(V2/V1) Pv=nRT 3. The attempt at a solution My attempt might be very wrong, but this is what i tried. I simplified Pv=nRT to T=PV/nR Plugged that into W=nRT*ln(V2/V1) W=PV*ln(V2/V1) I know the standard pressure (14.7psi) and the pressure inside the tire (80psig+14.7psi=94.7psi), but I don't know the volume of to plug in for the V.