Â· 43 comments. in Facts. An intelligence quotient, or IQ, is a score derived from one of several standardized tests designed to assess intelligence. The abbreviation âIQâ comes from the German term Intelligenz-Quotient, originally coined by psychologist William Stern.
Lower explosive limit. Lower explosive limit (LEL): The lowest concentration (percentage) of a gas or a vapor in air capable of producing a flash of fire in presence of an ignition source (arc, flame, heat). The term is considered by many safety professionals to be the same as the lower flammable limit (LFL).
Wellhead LEL Data. This subsection describes the additional lower explosive limit (LEL) measurements made in the. headspace or vents of water wells in the investigation area subsequent to publication of the. 2008 DMRM report and the PowerPoint presentation made by Dr. Eckstein in May 2009.