Ratio of the distance travelled by the centre of the spot to the distance simultaneously travelled by the mobile phase:
By definition the values are always less than unity. They are usually given to two decimal places. In order to simplify this presentation the values may be used: they correspond to the values multiplied by 100. Ideally, values are identical to the values used in column chromatography.
PAC, 1993, 65, 819 (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 845