H1.4 Air is contained in a vertical piston-cylinder device. The piston, with a mass of 30 kg and diameter of 10 cm, is in equilibrium with the gas. The outside ambient pressure is 101 kPa. Determine the absolute pressure of the gas (in kPa). Be sure to draw a free-body diagram.

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Work and Heat Transfer

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.