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Prefixes: Symbols of prefixes that mean a million or more are capitalized and those less than a million are lower case (M for mega (millions), m for milli (thousandths)).Ī space is used between the number and the symbol to which it refers.Symbols: Unit symbols are written in lower case letters except for liter and those units derived from the name of a person (m for meter, but W for watt, Pa for pascal, etc.).Thus, body temperature is written as 37 degrees Celsius. There is one exception: in "degree Celsius" (symbol ☌) the unit "degree" is lower case but the modifier "Celsius" is capitalized. Units: The names of all units start with a lower case letter except, of course, at the beginning of the sentence.For example, 250 mm = 250 millimeters, NOT 250 mms. Symbols: Symbols for units are never pluralized.Examples: 0.25 liter (quantity is less than one) and 250 milliliters (quantity is more than one). Units: Names of units are made plural only when the numerical value that precedes them is more than one.

Examples: meter, liter, and deka, NOT metre, litre, and deca.

All units and prefixes should be spelled as shown in this guide. NIST guides use American English spelling practice in accordance with the United States Government Printing Office Style Manual, found in Webster's Third New International Dictionary. Incorrect Terms | Pronunciation | Conversions | Time | International Paper Sizes Spelling Spelling | Plurals | Capitalization | Spacing | Punctuation | Decimal Point | Prefixes NIST SP 811 provides an editorial checklist for reviewing manuscripts' conformity with the SI and the basic principles of physical quantities and units. Verbal pronunciation of SI terminology is purposefully not addressed in the BIPM SI Brochure (French is the primary language, English is secondary), NIST SP 330 (uses American English spelling), NIST SP 811 (uses American English spelling), or IEEE/ASTM SI 10. International SI style and usage publications focus on written communication. Values of quantities are expressed using Arabic symbols for numbers paired with a unit symbol, often with a prefix symbol that modifies unit magnitude.

National Type Evaluation Program (NTEP)Ī benefit of the International System of Units (SI) is that written technical information is effectively communicated, overcoming the variations of language, including spelling and pronunciation.

National Conference on Weights and Measures (NCWM).

External Resources for Weights and Measures Expand or Collapse.

Fuels and Lubricants Subcommittee (FALS).National Legal Metrology Expand or Collapse.Laboratory Metrology Expand or Collapse.International Legal Metrology Expand or Collapse.OWM Products and Services Expand or Collapse.