The tonne, accustomed as the metric ton in the US1 (SI assemblage symbol: t, U.S. abbreviation: "mt"2), generally put as "metric tonne" to abstain abashing with ton, is a metric arrangement assemblage of accumulation according to 1000 kilograms. The tonne is not an International Arrangement of Units (SI) unit, but is accustomed for use with the SI.34 In SI units and prefixes, the tonne is a
Saturday, February 4, 2012
Unit symbol
The SI assemblage attribute for the tonne is "t". "T", "mT" and "mt" (especially in the aggregate "mmt" for "million metric tons") are aswell used, and "Te" (particularly in the adopted and nuclear industries) is sometimes used.citation needed These another abbreviations or symbols are agnate to SI terms: "T" is the SI assemblage attribute for the tesla, "Mt" for megatonne and "m" is acclimated as an SI prefix for "milli" - the 0.001 multiplier.
Origin and spelling
In France and the English-speaking countries that are predominantly metric, the spelling tonne is widespread. This is about accurate in the United Kingdom; however, the ton acclimated above-mentioned to metrication is agnate to 2,240 pounds (1,016 kg) (in the US this ton is usually referred to as the continued ton) and this is so abutting to the tonne that some humans draw little acumen and abide to use the old spelling. For example, even the Guinness Book of World Records accepts metrication after appearance this by alteration the spelling. For the United States, metric ton is the name for this assemblage acclimated and recommended by NIST.5 In the US an amateur acknowledgment of a ton about consistently refers to a abbreviate ton of 2,000 pounds (907 kg).
Ton and tonne are both acquired from a Germanic chat in accepted use in the North Sea breadth back the Middle Ages (cf. Old English and Old Frisian tunne, Old Top German and Medieval Latin tunna, German and French tonne) to baptize a ample cask, or tun.6 A abounding tun, continuing about a accent high, could calmly counterbalance a tonne. The old English wine barillet aggregate altitude accepted as a tun is abutting to a metric tonne in weight as it defines about 954 litres which for abounding frequently acclimated liquids (aqueous solutions) approximates to as abounding kilograms.
The spelling tonne pre-dates the addition of the SI in 1960; it has been acclimated with this acceptation in France back 1842,7 if there were no metric prefixes for multiples of 106 and above, and is now acclimated as the accepted spelling for the metric accumulation altitude in a lot of English-speaking countries.891011 In the United States, the assemblage was originally referred to application the French words millier or tonneau,12 but these agreement are now obsolete.1 The Imperial and US accepted units commensurable to the tonne are both spelled ton in English, admitting they alter in mass. Pronunciation of tonne (the chat acclimated in the United Kingdom) and ton is usually identical.
Ton and tonne are both acquired from a Germanic chat in accepted use in the North Sea breadth back the Middle Ages (cf. Old English and Old Frisian tunne, Old Top German and Medieval Latin tunna, German and French tonne) to baptize a ample cask, or tun.6 A abounding tun, continuing about a accent high, could calmly counterbalance a tonne. The old English wine barillet aggregate altitude accepted as a tun is abutting to a metric tonne in weight as it defines about 954 litres which for abounding frequently acclimated liquids (aqueous solutions) approximates to as abounding kilograms.
The spelling tonne pre-dates the addition of the SI in 1960; it has been acclimated with this acceptation in France back 1842,7 if there were no metric prefixes for multiples of 106 and above, and is now acclimated as the accepted spelling for the metric accumulation altitude in a lot of English-speaking countries.891011 In the United States, the assemblage was originally referred to application the French words millier or tonneau,12 but these agreement are now obsolete.1 The Imperial and US accepted units commensurable to the tonne are both spelled ton in English, admitting they alter in mass. Pronunciation of tonne (the chat acclimated in the United Kingdom) and ton is usually identical.
Conversions
One tonne is agnate to:
One megagram (exactly);
megagram is the official SI term, but about not acclimated in industry or shipping, nor colloquially
1000⁄0.453 592 37 pounds (exactly by definition),13 giving approximately
2205 lb (to four cogent digits)
98.42% of a continued ton
One continued ton (2,240 lb) is 101.605% of a tonne
110.23% of a abbreviate ton
One abbreviate ton (2,000 lb) is 90.72% of a tonne
One megagram (exactly);
megagram is the official SI term, but about not acclimated in industry or shipping, nor colloquially
1000⁄0.453 592 37 pounds (exactly by definition),13 giving approximately
2205 lb (to four cogent digits)
98.42% of a continued ton
One continued ton (2,240 lb) is 101.605% of a tonne
110.23% of a abbreviate ton
One abbreviate ton (2,000 lb) is 90.72% of a tonne
Alternate usage
A metric ton assemblage (MTU) can beggarly 10 kilograms (22 lb) aural metal (e.g., tungsten, manganese) trading, decidedly aural the USA. It commonly referred to a metric ton of ore absolute 1% (i.e. 10 kg) of metal.1415
In the case of uranium, the acronym MTU is sometimes advised to be metric ton of uranium, acceptation 1,000 kg.16171819
In the case of uranium, the acronym MTU is sometimes advised to be metric ton of uranium, acceptation 1,000 kg.16171819
Use of mass as proxy for energy
The tonne of trinitrotoluene (TNT) is acclimated as a proxy for energy, usually of explosions (TNT is a accepted top explosive). Prefixes are used: kiloton(ne), megaton(ne), gigaton(ne), abnormally for cogent nuclear weapon yield, based on a specific agitation activity of TNT of about 4.2 MJ/kg (or one thermochemical calorie per milligram). Hence, 1 kt TNT = 4.2 TJ, 1 Mt TNT = 4.2 PJ.
The SI assemblage of activity is the joule. Assuming that a TNT access releases 1,000 baby (thermochemical) calories per gram (4.2 kJ/g), one tonne of TNT is agnate to 4.2 gigajoules.
The SI assemblage of activity is the joule. Assuming that a TNT access releases 1,000 baby (thermochemical) calories per gram (4.2 kJ/g), one tonne of TNT is agnate to 4.2 gigajoules.
Unit of force
Like the gram and the kilogram, the tonne gave acceleration to a (now obsolete) force assemblage of the aforementioned name, the tonne-force, agnate to about 9.8 kilonewtons: a assemblage aswell generally alleged artlessly "tonne" or "metric ton" after anecdotic it as a assemblage of force. In adverse to the tonne as a accumulation unit, the tonne-force or metric ton-force is not adequate for use with SI, partly because it is not an exact assorted of the SI assemblage of force, the newton.
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