| Metric Tonne |
Articles about Tonne |
Information AboutMetric Tonne |
| CATEGORIES ABOUT TONNE | |
| units of mass | |
| non-si metric units | |
|
A tonne ('''t''') or '''metric ton''' ('''M/T'''), sometimes referred to as a ''metric tonne'', is a measurement of mass equal to 1,000 ), but this term is rarely used in practice. Though the spelling ''tonne'' predates the introduction of the SI system in 1960, it is now used as the standard spelling for the metric mass measurement in English. The similar Imperial Unit s and United States Customary Units are spelled '''ton''' in English. This unit was defined in the United States in 1866 Act of July 28, 1866, codified in 15 U.S.C. §205 as a ''millier'' or a ''tonneau''. However, neither of these are in use and though they still appear in the statute, they have been declared obsolete by notice of July 28, 1998, 63 F.R. 40333 [http://ts.nist.gov/ts/htdocs/200/202/SIFedReg.pdf DEFINITION 1 tonne is defined as 1000 Kilogram s or '''1 megagram''' ( Mg , kilokilogram is incorrect per CIPM, 1967: Recommendation 2http://www.bipm.org/en/CIPM/db/1967/2/) MULTIPLES ORIGIN The spelling ''tonne'' is from French . In Old English the spelling was tunne. The various spellings and meanings (tonne, ton, tun) derive from the late Latin ''tunna'', "cask" - a full cask about a metre high could easily weigh a tonne. It may also be of Celtic origin. CONVERSIONS One tonne is equivalent to:
EXPLANATION The official symbol is t. '''T''' and '''mT''' and '''mt''' (especially in the combination '''mmt''' for "million metric tons" compare to Mt for megatonne) are also sometimes 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 1000th (though in practice fractional prefixes aren't generally used with the tonne). '''Te''' is also sometimes used, particularly in the nuclear industry. In France and the English-speaking countries that are predominantly metric, the spelling tonne is widespread. However, in Britain, the ton used prior to metrication was the of 2000 lb (about 907 kg). Like grams and kilograms, tonnes gave rise to a (now obsolete) force unit of the same name: 1 tonne-force = 9.80665 Kilonewtons (kN), a unit also often called simply "tonne" or "metric ton" without identifying it as a unit of force. Note that it is only the tonne as a unit of mass which is accepted for use with SI; the tonne-force or metric ton-force is not acceptable for use with SI. USE OF MASS AS PROXY FOR ENERGY See Also: TNT equivalent The tonne of Trinitrotoluene (TNT) is used as a proxy for energy. Prefixes are also used e.g. kilotonne, megatonne, gigatonne; especially for expressing Nuclear Weapon Yield , based on a Specific Combustion Energy of TNT of 4.184 MJ / Kg (or one Calorie —specifically a ''thermochemical'' calorie—per Milligram ). Hence, 1 Kt TNT = 4.184 TJ , 1 Mt TNT = 4.184 PJ . The SI unit of energy is the Joule . Assuming that TNT contains 1000 small (thermochemical) Calorie s per gram (4.184 KJ /g), one tonne TNT is more correctly referred to as 4.184 Gigajoules . It is usually used to describe the energy of explosions. METRIC TON IN POPULAR CULTURE
DERIVED UNITS metric ton unit A metric ton unit (MTU) can mean 10 kg within metal (e.g. tungsten, manganese) trading, particularly within the USA. It traditionally referred to a metric ton of ore containing 1% (i.e. 10 kg) of metal. http://www.emis.platts.com/thezone/guides/platts/metals/conversion.html http://www.unc.edu/~rowlett/units/dictM.html If the metal is uranium, the acronym 'MTU' is sometimes considered to be 'metric ton of uranium' i.e. 1000 kg (http://www-pub.iaea.org/MTCD/publications/PDF/rwmp-3/REFERENCE.pdf http://www.hanford.gov/rl/uploadfiles/ea/ea1319/ea1319.html, http://www.y12.doe.gov/library/acronyms/letter.php?index=M, http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0544/r4/ ). SEE ALSO REFERENCES
|
|
|