Propagation 4 : The spread of combustion through a solid, gas, or vapor, or the spread of a fire from one combustible to another combustible. See also: Flame Spread
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}