Answer: Entropy can be defined as a way of measuring of randomness and uncertainty of the particles because manufacturers like changes in the temperature and pressure. Entropy is a thermodynamically stable quantity directly linked to the body of particles. The Randomness of a system of particles is measured here and known as Entropy.
Entropy can be defined in numerical terms as the ratio of the heat changes over the absolute temperature. The SI unit of Entropy is finally given as Joule/Kelvin, derived from the unit of energy/unit of temperature. The reaction is said to be spontaneous when the entropy of the reaction is positive.