User:Milton Beychok/Sandbox: Difference between revisions
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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]] at 3.98 °C.<ref>The density of air-free water at a [[pressure]] of 1 [[Pressure|atmosphere]]. [http://www.iapws.org/relguide/fundam.pdf 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.</ref> It is not an [[SI]] unit but is accepted for use with the SI.<ref>Section 4.1 of [http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf The International System of Units (SI)] (PDF), 8th Edition, 2006</ref> | 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]] at 3.98 °C.<ref>The density of air-free water at a [[pressure]] of 1 [[Pressure|atmosphere]]. [http://www.iapws.org/relguide/fundam.pdf 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.</ref> It is not an [[SI]] unit but is accepted for use with the SI.<ref>Section 4.1 of [http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf The International System of Units (SI)] (PDF), 8th Edition, 2006</ref> | ||
Using the SI prefixes, the correct SI termonology for a tonne would be | Using the SI prefixes, the correct SI termonology for a tonne would be a ''megagram'' (Mg) but this term is not often used. In most countries, ''tonne'' is used as the standard terminology for the metric mass measurement. | ||
== References == | == References == | ||
{{reflist}} | {{reflist}} | ||
Revision as of 16:40, 7 May 2009
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 at 3.98 °C.[1] It is not an SI unit but is accepted for use with the SI.[2]
Using the SI prefixes, the correct SI termonology for a tonne would be a megagram (Mg) but this term is not often used. In most countries, tonne is used as the standard terminology for the metric mass measurement.
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