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Some conditions:

Total LO2 mass = 68,000 kg

P_initial = 3 psig = 17.7 psia

P_final = 0 psig - 14.7 psia

T_initial = let's say -297 F

T_final = ?

I assume I can use the pressure change to somehow figure out the density difference, but I haven't taken thermodynamics in a while, so I am stuck on which equations/assumptions to use.

Thanks for the help.