Help with thermo problem?

A gas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) If the relationship between pressure and volume during the compression is pV = constant, determine the volume, in liters, at a pressure of 3 bar. (b) Repeat for a... show more A gas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar.
(a) If the relationship between pressure and volume during the compression is pV = constant, determine the volume, in liters, at a pressure of 3 bar.
(b) Repeat for a linear pressure–volume relationship between the same end states.
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