Question

What is the physical significance of entropy?

Answer 1

Entropy is one of the scientific word mostly used in the chemistry. It is the term used to understand or describe the second law of the Thermodynamics in chemistry.

Entropy means the degree of the disorder or randomness in the system.

It is totally impossible to determine the Entropy of any substances. We can only determine the change in Entropy and we need that only to study Thermodynamics.  Like the Internal Energy and Enthalpy, It is also the state Function.

It is denoted by the symbol S.

ΔS = Sfinal - S intial.

Also,

ΔS = q/t

where q is the Heat Produced when the Process is carried out Reversibly and Isothermaly (at constant temperature).

Its S.I. unit is J/K or eu (entrropy unit).

Hope it helps.

Answer 2

Physical significance of Entropy. The entropy of a substance is real physical quantity and is a definite function of the state of the body like pressure, temperature, volume of internal energy.