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.
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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 values are used mainly for simplicity. These values are generally easier to use to obtain percentages between a couple objects instead of using values that are already established.
RF - Republique Francaise (= French Republic).
Place value is not used in the Roman numeral system.