What is the relationship between the second law of thermodynamics and entropy?

1 Answer

Explained below


Second law of thermodynamics tells about the degradation of energy caused due to entropy generation during heat transfer between system & surrounding through a finite temperature difference.

The entropy is a property of thermodynamic system which is measure of randomness in a system. The change in entropy is caused due to internal as well as external dissipative effects. The change in entropy of the universe is always non-negative i.e.

#\Delta S_{\text{univ}}\ge0#

Hence, if there is entropy generation, there is degradation of energy.