Section 8 in The Standards of Weights and Measures (National Standards) Rules, 1988
8. Special units
(1)The units specified in Schedule V shall be used in such manner that their values may be expressed in terms of such SI unit or combination of SI units, as may be appropriate.(2);The multiples and sub-multiples of the units specified in Schedule V shall be formed with the help of SI prefixes specified in Schedule III.
