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).
1 As an investigative tool, SENSITÂ® GOLD LEL sensor is designed to find the source of combustible gas leaks fast.  SENSITÂ® GOLD combustible gas leak detector and multi-gas monitor in one user-friendly instrument. As an investigative tool, SENSITÂ® GOLD LEL sensor is designed to find the source of combustible gas leaks fast.