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Tonne, unit of measure |
| A tonne or metric ton (symbol t), sometimes 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. 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 units and United States customary units are spelt ton in English. This unit was defined in the United States in 1866 as a millier or a tonneau. 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 long ton of 2240 pounds (approximately 1016 kg). This is so close to the tonne that many people draw little distinction and continue to use the old spelling. |
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kilogram, gram, exagram, petagram, teragram, gigagram, megagram, hectogram, dekagram, decigram, centigram, milligram, microgram, nanogram, picogram, femtogram, attogram, dalton, kilogram-force square second/meter, kilopound, kip, slug, pound-force square second/foot, pound, pound (troy or apothecary), ounce, ounce (troy or apothecary), poundal, ton (short), ton (long), ton (assay) (US), ton (assay) (UK), ton (metric), kiloton (metric), quintal (metric), hundredweight (US), hundredweight (UK), quarter (US), quarter (UK), stone (US), stone (UK), pennyweight, scruple (apothecary), carat, grain, gamma, talent (Biblical Hebrew), mina (Biblical Hebrew), shekel (Biblical Hebrew), bekan (Biblical Hebrew), gerah (Biblical Hebrew), talent (Biblical Greek), mina (Biblical Greek), tetradrachma (Biblical Greek), didrachma (Biblical Greek), drachma (Biblical Greek), denarius (Biblical Roman), assarion (Biblical Roman), quadrans (Biblical Roman), lepton (Biblical Roman), Planck mass, Atomic mass unit, Electron mass (rest), Muon mass, Proton mass, Neutron mass, Deuteron mass, Earth's mass, Sun's mass
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