) A rigid tank contains water vapor at 250 C and unknown pressure. When the tank is cooled to  124 C, the vapors start condensing. Find the initial pressure in the tank.  b) A piston–cylinder device initially contains 50 L of liquid water at 40°C and 200 kPa. Heat is  transferred to the water at constant pressure until the entire liquid is vaporized. i.What is the mass of the water?   ii.What is the final temperature?   iii. Determine the total enthalpy change

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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.