upper flammable limit
Also found in: Acronyms.
upper flammable limit[¦əp·ər ′flam·ə·bəl ‚lim·ət]
The maximum percentage of flammable gas or vapor in the air above which ignition cannot take place because the ratio of the gas to oxygen is too high. Also known as upper explosive limit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.