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What is Thermodynamics? Thermodynamics is a branch of Physics which deals with the conversion of heat energy into mechanical work and vice-versa. A gaseous system is called a thermo dynamical system. The state of the system is represented in terms of pressure (p), volume (V), temperature (T) and heat content (Q) of the gas. These four quantities are called thermo dynamical parameters of the system. Thermodynamics Four thermo dynamical operations 1) Isothermal changes : wherein temperature remains constant. The pressure and volume of a given mass of gas change. Two essential conditions are: a) Walls of container must be perfectly conducting. b) Changes must be slow. 2) Adiabatic changes : wherein heat content of a gaseous system remains constant. The pressure and volume of a given mass of gas change with consequent change in temperature. Two essential conditions are: a) Walls of container must be perfectly insulating. b) Changes must be sudden. 3) Isobaric changes...