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).
Stand-alone gas cylinders range in size from 11 liters to 103 liters, and convenient multi-gas mixtures enable calibration of multiple gases at once, including common mixtures such as carbon monoxide, hydrogen sulfide, and combustibles for LEL sensor calibration.