Followings are the terms which are frequently used in Thermodynamics:-
1. Molecules:- A substance consists of a large number of particles known as molecules.
2. State:- If no change is observed in a system, at this point all the properties of the system can be measured which gives us a set of properties which completely describes the condition of the system, known as the state of the system.
3. Process:- If a system undergoes any change from one equilibrium state to another equilibrium.
4. Cycle:- If a system returns to its initial state at the end of the process.