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).
Stands for âLow-Density Lipoproteinâ. LDL is a type of lipoprotein which contains the most cholesterol in the blood. It is called low density because its particles are tend to be less dense than other kinds of cholesterol particles. In the cholesterol world, the LDL cholesterol is known for wearing a black hat.