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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.
You find the the smallest and largest values. The interval is the largest minus the smallest.
The range.
It is the largest value less the smallest one.
If possible, find the largest and smallest possible values of the variable under study. Then the range = Largest Value minus Smallest Value.
RangeThe term for the difference between the smallest and the largest values in a set of data is called the range. It is probably derived from the idea that the values of the numbers in the data could range anywhere from the lowest to the highest values but not beyond. The range is a measure of how disperse (spread out) the values are but it is not a very powerful measure.