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Gram
The gram (alternative British English spelling: gramme; SI unit symbol: g) (Greek/Latin root ''grámma'') is a metric system unit of mass. Gram can be abbreviated as gm or g.()()
Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice"〔(Décret relatif aux poids et aux mesures ), 1795〕 (later 4 °C), a gram is now defined as one one-thousandth of the SI base unit, the kilogram, or 1×10−3 kg, which itself is defined as being equal to the mass of a physical prototype preserved by the International Bureau of Weights and Measures.
==Official SI symbol==
The only unit symbol for gram that is recognised by the International System of Units (SI) is "g" following the numeric value with a space, as in "640 g". The SI does not support the use of abbreviations such as "gr" (which is the symbol for grains),〔National Institute of Standards and Technology (October 2011). Butcher, Tina; Cook, Steve; Crown, Linda et al. eds. ("Appendix C – General Tables of Units of Measurement" ) (PDF). (''Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices'' ). NIST Handbook. 44 (2012 ed.). Washington, D.C.: U.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology. ISSN (0271-4027 ). OCLC . Retrieved 30 June 2012.〕 "gm" or "Gm" (the SI symbol for gigametre).
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