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**ideal gas equation PV=mRT?**If all such processes are occur in closed systems, this is so. Because it is isothermal the temperature is constant, R is constant and so is mass for a closed system. So the left side of the equation should be PV, which is a polytropic process with n=1. But my doubts comes from that in books PV=mRT is always called ideal gas equation, not a polytropic process with n=1 and when it comes to a isothermal process they use ideal gas equation.

Thank you.