User:Milton Beychok/Sandbox
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A tonne (t) or metric tonne (also referred to as a metric ton), is a measurement of mass equal to 1000 kg, or almost exactly the mass of one litre of pure water.[1] It is not an SI unit but is accepted for use with the SI.[2] If prefixes were used completely consistently, the SI unit for a tonne would be a "megagram" (Mg, see SI prefix), but this term is rarely used. Though the spelling tonne pre-dates the introduction of the SI system in 1960 (it has been used in France for about two and a half centuriesTemplate:Fact), it is now used as the standard spelling for the metric mass measurement in some English-speaking countries. The comparable imperial and US customary units are spelled ton in English.
References
- ↑ The density of air-free water at a pressure of 1 atmosphere. Guideline on the Use of Fundamental Physical Constants and Basic Constants of Water September 2001, The International Association for the Properties of Water and Steam.
- ↑ Section 4.1 of The International System of Units (SI) (PDF), 8th Edition, 2006