Numbers with units of measure
Leave a space between the number and the unit of measure and use open punctuation (no periods). Use a hyphen if you’re using the number with the unit of measure as an adjective.
For Australia, Brazil, Canada, France, and UK, use the metric system.
For the U.S., use the imperial system and provide metric equivalents in parentheses after the imperial measurement where it’s useful.
8 fl oz
128 MB of RAM
on hold for 3 minutes
one inch (2.54 cm)