Air expands in an isothermal process from a volume of 0.5 m3 and a pressure of 850 kPa, to a volume of 1.2 m3. The temperature of the air is 25oC. Determine the work done by the air in this expansion process.
Given: T1 = T2 = 25oC ; V1 = 0.5 m3; P1 = 850 kPa; V2 = 1.2 m3
An isothermal process involving an ideal gas can be modeled as a polytropic process with
n = 1.
Therefore,
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