Entropy of vaporization

The entropy of vaporization, often denoted as \( \Delta S_{vap} \), is a thermodynamic quantity that describes the change in entropy when one mole of a substance transitions from the liquid phase to the vapor phase at a given temperature and pressure. It reflects the degree of disorder or randomness in the system. When a liquid evaporates, its molecules gain sufficient energy to overcome intermolecular forces and enter the gas phase, which is characterized by greater molecular movement and spacing.