The value of ∆S for spontaneous process is

For a spontaneous process in an isolated system ∆S should be positive i.e ∆S > 0.


In thermodynamics, S stands for entropy. The entropy of any system is defined as the degree of randomness in it.

A spontaneous process is an irreversible process, and some external agents could only reserve it.

For a spontaneous process, the total entropy change, ΔStotal is always greater than zero.

The total entropy of the system can be given by the following equation

ΔStotal=ΔSsys + ΔSsurr


ΔStotal= total entropy change for the process

ΔSsys = entropy change of the system

ΔSsurr = entropy change of the surrounding


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