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- Always use the same unit for a given quantity.
- Use the most appropriate unit for the quantity being measured.
- Use the International System of Units (SI).
- Use a space, not a hyphen between the number and the unit.
- Use a zero before the decimal point when the number is less than one.
- Use the correct form of abbreviations for units.
- Spell out units when they are used in text.
- Avoid using plurals for units.
- Use the same form of unit for both singular and plural. Use a period after abbreviations of units.
