(a) The selected multiple or submultiple prefixes for SI metric units shall result in numerical values between 1 and 1000, except that centimeters or millimeters may be used where a length declaration is less than 100 centimeters. For example, ``1.96 kg'' instead of ``1960 g'' and ``750 mL'' instead of ``0.75 L''.
(b) The following symbols for SI metric units and none others may be employed in the required net quantity declaration: centimeter--cmcubic centimeter--cm \3\cubic decimeter--dm \3\meter--mmilligram--mgliter--L or lmilliliter--mL or mlsquare decimeter--dm \2\cubic meter--m \3\kilogram--kgmicrometer--[micro]mgram--gmillimeter--mmsquare meter--m\2\square centimeter--cm\2\
Note: Symbols, except for liter, are not capitalized. Periods should not be used after the symbol. Symbols are always written in the singular form.