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).
LEP - Light Emitting Plasma. The LEP is a high intensity light which is often put in a parallel with the LED. The LEP is not the same, it is actually a form of metal halide lamp and induction lamp. It has a high pressure quartz bulb that contains metal halides and no electrodes.