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).
Unlike what many people think lel is not an acronym in the same fashion that LOL is (it does not mean laughing extremely loud, laughing extra loud or similar).Lel (and variations including lal) resulted from the use of random vowels substituted in place of the 'o' in LOL.xplosive Limits The range of concentrations (% by volume in air) of a flammable gas or vapor that can result in an explosion from ignition in a confined space. Usually given as Upper and Lower Explosive Limits (see UEL and LEL).