THERMODYNAMICS:

It can be defined as the science which deals with the relation between heat, work and properties of the system.

Use of Thermodynamics:

            Designing work producing machine – Heat engine, Steam engine, Gas turbine 

            Designing work Absorbing machine – Refrigerator,Air compressor

            No work transfer systems                  - boiler, condenser,furnace.

Where no work is transferred, the Thermodynamic problem involve the use of heat  to produce the change in state or the transfer of mass with a chemical reaction, as in the combustion of a fuel.

 System:

            It can be defined as a definite quantity of matter, which is bounded by a closed surface. 

Surroundings:

            Anything other than a system are called surroundings