Question

What is meant by Entropy?

Answer 1

Entropy

1. Entropy is defined as a measure of randomness or disorder of a system.
2. Entropy is a thermodynamic function.
3. It is a state function. It depends on the state of the system and not the path that is followed.
4. Entropy is an extensive property which means that it scales with the size or extent of a system.
5. SI unit of entropy is $\mathrm{J}/\mathrm{Kmol}$.
6. The entropy of the universe is continuously increasing
7. Total entropy change is always positive. The entropy of a system plus the entropy of its surroundings will be greater than zero.
   $∆{\mathrm{S}}_{\mathrm{Total}}=∆{\mathrm{S}}_{\mathrm{surroundings}}+∆{\mathrm{S}}_{\mathrm{System}}>0$