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A pistoncylinder device contains 1.8 kg of nitrogen initially at 90 kPa and 20C. The nitrogen is now compressed slowly in a polytropic process with a polytropic index of 1.3 until the volume is reduced to one-third. Determine the work done and the heat transfer for this process. As usual, try solving this problem yourself before watching the solution. This is the second example for the Polytropic Processes main lecture video. The links to that 10-minute video, the other examples for this topic, and the other lectures of the Thermodynamics course are found in the description below. Using the expression we derived in the main lecture video, we see that we need the volumes and P2. P2 can be easily found because if we know that PV^1.3 is constant, we can solve for P2, and use the ratio between V1 and V2 (knowing that the volume was reduced to one third), to find that P2 is 375.405076 kPa. V1 can be found using the ideal gas equation. We look up the gas const
