Apiston–cylinder device initially contains 0.4 kg of nitrogen gas at 160 kpa and 140°c. nitrogen is now expanded isothermally to a pressure of 100 kpa. determine the boundary work done during this process. the properties of nitrogen are r = 0.2968 kj/kg·k and k = 1.4.

Explanation:

With the respectively considerations, we calculate the initial Volume of piston cylinder,

State 1,

State 2,

So, calculating the work done (W) relate to isothermal expansion of ideal gas

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