Question

I need the definition of the word: entropy

Answer 1

Entropy is a measure of the number of specific ways in which a thermodynamic system may be arranged.

Answer 2

In thermodynamics, entropy( symbol S) commonly understood as a measure of disorder. According to the second law of thermodynamics the entropy of an isolated system never decreases; such a system will spontaneously proceed towards thermodynamic equilibrium, the configuration with maximum entropy.