We wish to determine the final state for the gas in an inflated balloon. Initially, the balloon has a volume of V i at rest. The volume of the balloon is related to the internal pressure by V = a·P + b, where a and b are constants. The balloon is to be inflated by air from our lungs at Plung and Tlung which are known and assumed to remain constant during inflation. Heat transfer through the walls of the balloon can be ignored. The system is defined to be the gas inside the balloon at any time. Starting with the general energy balance, simplify to write the balance in terms of {CP, CV, Tlung, Plung, Ti, Tf, TR, PR } and either {Vi, V} or { Pi,Pf }. This will demonstrate that measurement of Vor Pf is sufficient to determine Tf. Assume air is an ideal gas.

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