A tonne (t) or metric ton (M/T), also referred to as a metric tonne, is a measurement of mass equal to 1,000 kilograms. It is not an SI unit but is accepted for use with the SI.Section 4.1 of [LINK: http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf] The International System of Units (SI), 8th Edition, 2006 The proper SI unit for a tonne would be a "megagram" (Mg, see SI prefix), but this term is rarely used in practice. Though the spelling tonne predates the introduction of the SI system in 1960 (it has been used in France for centuries, where it comes from) , it is now used as the standard spelling for the metric mass measurement in English. The comparable imperial and US customary units are spelled ton in English. In the USA this unit was defined in 1866 Act of July 28, 1866, codified in 15 U.S.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # TAGS