Explain the concept entropy Explain the concept entropy Solution Answer- Entropy - Entropy is a measure of the randomness of a substances. In statistical mechanics, entropy is a measure of the number of ways in which a system may be arranged, often taken to be a measure of \"disorder\" (the higher the entropy , the higher the disorder). It is denoted by S, the entropy of substance and universe is calculated by appropriated formulas. deltaG =deltaH - Tdelta S .