Question: Which is a more valuable resource for work production in a closed system - l5 ft3 of air at 100 psia and 250F or 20

Which is a more valuable resource for work production in a closed system - l5 ft3 of air at 100 psia and 250°F or 20 ft3 of helium at 60 psia and 200°F? Take T0 = 77°F and P0 = 14.7 psia.

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