A closed piston-cylinder contains 5-kg of water. Initially, the temperature of the water is 225°C while the volume is 0.25 m3. The container is then isothermally expanded until the volume increases to 0.5 m3. a) Determine the final pressure, in MPa. Report your result to two decimal places using rounding. b) Determine the initial pressure, in kPa. Write your answer to one decimal place. c)Determine the change of internal energy of the system, in kJ. Report your answer to one decimal place using rounding.

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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.