Entropy of fusion - Definition and Overview

The Entropy of fusion of a substance represents the increase in the degree of disorder involved in the transition from an organized crystalline solid to the disorganized structure of a liquid. It is denoted as Δ_fusS and normally expressed in J / mol · K

A natural process such as a phase change will occur when the associated change in the Gibbs free energy is negative. It follows that the entropy of fusion is related to the melting point and the heat of fusion:

<math>\Delta_{fus} H = T_{fus} \times \Delta_{fus} S<math>