Latent Heat 11 : The heat absorbed or given off by a substance as it passes from a liquid to a gas or a solid to a liquid, measured in Btu per unit weight
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}