A 180-ft3 tank initially filled with air at 1 atm and 708F
Chapter 6, Problem 6.117(choose chapter or problem)
A 180-ft\(^{3}\) tank initially filled with air at 1 atm and 70\(^{\circ}\)F is evacuated by a device known as a vacuum pump, while the tank contents are maintained at 70\(^{\circ}\)F by heat transfer through the tank walls. The vacuum pump discharges air to the surroundings at the temperature and pressure of the surroundings, which are 1 atm and 70\(^{\circ}\)F, respectively. Determine the minimum theoretical work required, in Btu.
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