An avoirdupois ounce is equal to 437.5 grains, while an international troy ounce is equal to 480 grains. It is based upon the mass of a single grain of cereal.
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more smaller units than the bigger units
A millilitre.
2.5 of anything is typically smaller than 4.2 of the same thing.
The answer will depend on the two units. It will entail multiplication by a number that is greater than 1 (or division by a number smaller than 1).
There are: decimetre, centimetre, millimetre, micrometre, nanometre, picometre, femtometre, attometre, zeptometre, yoctometre ... oops that's 10 units smaller than a metre.