(a) volumetric percentage of the propane liquid phase left the cylinder
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(b) Mass fraction of liquid propane in the cylinder
(c) What’s the volume of the cylinder excluding propane... Imagine that with propane is a bulk volume and without propane (which is occupying the pore space) you are evaluating the volume of the material. Assume it’s made of iron (density is 491 Ib/ft3)