Thermodynamic Equilibrium

A system is said to be in the thermodynamic equilibrium if it is in :-
(i) Thermal Equilibrium (Enthalpy and Temperature)
(ii) Mechanical Equilibrium (Equility of forces and Pressure)
(iii) Chemical Equilibrium (Equility of Chemical Potential)

Properties of System

(A)Intensive(Intrinsic) Properties:- Independent of Mass (Example:- Temperature, pressure, Density, Thermal Conductivity).
(B)Extensive(Extrinsic) Properties:- Depends on Mass (Example:- Mass, Volume, Internal Energy, All form of energy,etc.).

Note 1:- Ratio of two extensive properties is an intensive property.
Note 2:- All speific properties and intensive properties except(Specific Density)

Immportant point with respect to Properties

(1) Properties are point function.
(2) Properties are independent of past history.
(3) Properties are exact differential.