Four thermodynamics process are:-
(i) Isothermal process: Temperature remains constant.
(ii) Adiabatic process:- No flow of heat either into or out from the system.
(iii) Isochoric process:- Volume of the system remains constant.
(iv) Isobaric process:- Pressure remains constant
Indicator diagram: are graphical representation of cyclic variations of pressure and volume within a heat engine.
