A hyphen is used to join 2 spelled-out units of measure.
pascal-second
A hyphen is used to join a unit of measure and the number associated with it when the combination is used as an adjective. (See Temporary Compounds in 8.3.1, Punctuation, Hyphens and Dashes, Hyphen.)
an 8-L container |
|
a 10-mm strip |
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