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Paraffin wax has a larger particle size than Stearic acid.

Stearic acid has the chemical formula: C18H36O2 (the numbers should be sub-set, i.e. small and below the line)

Paraffin has the general formula of: CnH2n+2 but has between 20-40 carbon atoms. 

The number of carbon atoms is a simple way to compare their size - Stearic acid is smaller at only 18 carbon atoms to Paraffin wax's 20-40 carbon atoms.

The number of carbon atoms in crude oil fractions determines their properties, e.g. viscosity and boiling point.

Hope that helps!

Emma


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