A system of units in which derived units are obtained from a set of fundamental or base units by way of simple multiplication or division or both such that no numerical factors comes up is called coherent system of units, e.g., S.I.
A system of units in which derived units are obtained from a set of fundamental or base units by way of simple multiplication or division or both such that no numerical factors comes up is called coherent system of units, e.g., S.I.