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Tip 13: Units of Measure

Use the slash (/) in place of ‘per’ between two abbreviated units of measurement.
40 psi/ft
15 cm/s
40 lbm/ft

Use the degree sign (°) with angles, temperatures [except metric K (Kelvin)], and compass coordinates.
20° slope

Abbreviate units of measurement in the text only when used with numerical values (unless the abbreviation replaces a very long phrase, such as ‘several scf/D’ for ‘several standard cubic feet per day’). 25 ft
50 x 103 ft3/D
10 dm3
3 cm3

Use the same abbreviation for both singular and plural forms of measurements.