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Megatonnes : ウィキペディア英語版
Tonne

The tonne () (British and SI; or metric ton (in the United States) is a non-SI metric unit of mass equal to 〔(Weights and Measures Act 1985 ). National Archives (London), 2014. Accessed 13 Aug 2014.〕〔(Table 6 ). BIPM. Retrieved on 2011-07-10.〕〔(The International System of Units (SI) ) (PDF), 8th Edition, 2006, Section 4.1〕 or one megagram (Mg); it is equivalent to approximately pounds, or 0.984 tons (imperial). Although not part of the SI ''per se'', the tonne is "accepted for use with" SI units and prefixes by the International Committee for Weights and Measures, along with several other units like the bar, litre and day.
==Symbol and abbreviations==

The SI symbol for the tonne is "t", adopted at the same time as the unit itself in 1879.〔 Its use is also official within the United States, having been adopted by the US National Institute of Standards and Technology.〔 It is a symbol, not an abbreviation, and should not be followed by a period. Informal and non-approved symbols or abbreviations include "T", "mT", "MT", and "mt".〔
〕 Some of these are actually SI symbols for other units: "T" is the SI symbol for the tesla and "Mt" is the SI symbol for megatonne (equivalent to one teragram); if describing TNT equivalent units of energy, this is equivalent to 4.184 petajoules.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Tonne」の詳細全文を読む



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