Pressure= 200 psia, Air present =100 lbs,T1=180oF,T2=80oF,
(a) Specific Volume,
P1V1=RT1
200×V=53.33×(180+460)
V=170.656 ft3/lbm
(b)
Volume of the tank ,
V= 60170.656×100=284.426ft3
(c) for the final specific volume
P2V2=RT2
V2=20053..33×(80+460)=143.991
(d)
Final pressure
T1P1V1=T2P2V2
P2=333.33 psia
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