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the volatility of any unknown compound can be known by comparison method between the compound whose volatility is known by the use of paper chromatography.

since the high volatile compound has less or no adsorptions to the stationary phase of the parer (the compound is less polar or non-polar) it will move high with the solvent, thus, having high Rf value.

The polar compound or less volatile compound will have less Rf value.

The conclusion therefore, can be made from the differences in their Rf values

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