In thermodynamics, Entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, commonly understood as a measure of disorder.
Systems that are not isolated may decrease in entropy, provided they increase the Entropy of their en.
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.
In thermodynamics, Entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, commonly understood as a measure of disorder