units of measurement
Use numerals with units of measurement and time in technical papers and reports, even when the number is less than 10. In some outreach publications, you may spell out numbers less than 10, especially with units of time. Except with $, °, and %, leave a space between the numeral and the unit.
| 2 kW | 7 cm2 | 16.8% | |
| 3 m | 8-hour days | 300 Btu | |
| 5 years | $2 billion | 45° |
Unless your profession, technical field, or scientific discipline specifies something different, use the abbreviations in NREL's list of technical abbreviations or the National Institute of Science and Technology's Guide.
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