A form of energy associated with and proportional to molecular motion. It can be transferred from one body to another by radiation, conduction, or convection; unlike latent heat, sensible heat is accompanied by a change in temperature.—of combustion: The heat evolved when a definite quantity of a substance is completely oxidized (burned).—of crystallization: The heat evolved or absorbed when a crystal forms from a saturated solution of a substance;—of dilution: The heat evolved per mole of solute when a solution is diluted from one specific concentration to another.—of formation: The heat evolved or absorbed when a compound is formed in its standard state from elements in their standard states at a specified temperature and pressure.—of fusion: The heat required to convert a substance from the solid to the liquid state with no temperature change (also called latent heat of fusion or melting).—of hydration: The heat associated with the hydration or solvation of ions in solution; also the heat evolved or absorbed when a hydrate of a compound is formed.—of reaction: The heat evolved or absorbed when a chemical reaction occurs in which the final state of the system is brought to the same temperature and pressure as that of the initial state of the reacting system.—of solution: The heat evolved or absorbed when a susbtance is dissolved in a solvent.—of sublimation: The heat required to convert a unit mass of a substance from the solid to the vapor state (sublimation) at a specified temperature and pressure without the appearance of the liquid state.—of transition: The heat evolved or absorbed when a unit mass of a given substance is convereted from one crystalline form to another.—of vaporization: The heat required to convert a substance from the liquid to the gaseous state with no temperature change (also called latent heat of vaporization).
