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The rf value is shorthand for the retention value of a substance. It is used in chromatography to determine the components of an unknown sample.
Blue.
The largest Rf value is 1, which occurs when the compound remains at the origin of the chromatogram and does not move at all. The smallest Rf value is 0, which happens when the compound moves with the solvent front and does not adhere to the stationary phase.
RF - Republique Francaise (= French Republic).
The same amount of time as it takes light waves; RF (radio frequency) is a type of electromagnetic wave, just like light. To get the time, divide the distance by the speed (in this case, the speed of light).