The air in an insulated, rigid compressed-air tank whose volume is 0.5 m3 is initially at 2400 kPa and 20°C. Enough air is now released from the tank to reduce the pressure to 2000 kPa. Following this release, what is the temperature of the remaining air in the tank? The gas constant of air is 0.287 kPa·m3/kg·K. The specific heats of air at room temperature are cp = 1.005 kJ/kg·K and cv = 0.718 kJ/kg·K.

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It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.