The 'Rf'(retention or retardation factor) value for any component in paper chromatography cannot be greater than

Rf value=Distance travelled by substance from base linex Distance travelled by eluent(solvent) from base liney The distance travelled by solvent is always greater than the distance travelled by the component.Hence,'Rf' value lies between 0 to 1.'Rf' value zero means where component remains fixed at its origin.'Rf' value one means,that the component migrates as fast as with the solvent,which means that the substrate does notbind with the stationary phase and travels with the solvent front.'Rf' value depends on temperature and nature of solvent used in the experiment.