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Tonne
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This article is about the
metric unit of mass. For other ton units, see
Ton. For other uses, see
Tonne (disambiguation).
The tonne (unit symbol t) or often written although this conflicts with other SI symbols. The tonne is not a unit in the In SI units and
prefixes, the tonne is a megagram (Mg).
Contents
Unit Symbol
The unit symbol for the tonne is t. T and mT and mt (especially in the combination mmt for million metric tons compare to Mt for megatonne) are also occasionally used, but all of these are deprecated since they conflict with internationally agreed SI symbols. (T is the SI symbol for the
tesla and m is SI prefix 'milli', meaning 0.001.) Te is also sometimes used, particularly in the offshore and nuclear industries.
Origin and spelling
In France and the English-speaking countries that are predominantly metric, the spelling tonne is widespread. This is generally true in Britain; however, the ton used prior to metrication was the
long ton of 2,240 pounds (1,016 kg) and this is so close to the tonne that some people draw little distinction and continue to use the old spelling. For example, even the
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