User:Milton Beychok/Sandbox: Difference between revisions
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Using the SI prefixes, the correct SI terminology 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. | Using the SI prefixes, the correct SI terminology 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. | ||
== Origin == | |||
The word ''tonne'' is from the [[French language]]. In [[Old English]], the spelling was ''tun'' and it referred to a a barrel or cask with a volume of about 954 litres (almost a cubic metre), which for wine, beer and many commonly used aqueous solutions would weigh about a tonne. | |||
==Conversions== | |||
One tonne is equivalent to: | |||
*One megagram (exactly); | |||
**This is the official SI term, but not generally used in industry, in shipping nor [[colloquialism|colloquially]] | |||
*{{frac|1000|0.45359237}} [[Pound (mass)|pounds]] (exactly by definition), giving approximately | |||
**2204.622 621 848 775 807 lb (to 19 [[significant digit]]s) | |||
**2204.622 622 lb (to ten significant digits)—an easy-to-remember figure | |||
**2205 lb (to four significant digits) | |||
*98.44% of a [[long ton]] | |||
**One long ton (2240 lb) is 101.605% of a tonne | |||
*110.23% of a [[short ton]] | |||
**One short ton (2000 lb) is 90.72% of a tonne | |||
* 32,150.75 troy ounces | |||
== References == | == References == | ||
{{reflist}} | {{reflist}} | ||
Revision as of 17:21, 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 cubic metre 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 terminology 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.
Origin
The word tonne is from the French language. In Old English, the spelling was tun and it referred to a a barrel or cask with a volume of about 954 litres (almost a cubic metre), which for wine, beer and many commonly used aqueous solutions would weigh about a tonne.
Conversions
One tonne is equivalent to:
- One megagram (exactly);
- This is the official SI term, but not generally used in industry, in shipping nor colloquially
- Template:Frac pounds (exactly by definition), giving approximately
- 2204.622 621 848 775 807 lb (to 19 significant digits)
- 2204.622 622 lb (to ten significant digits)—an easy-to-remember figure
- 2205 lb (to four significant digits)
- 98.44% of a long ton
- One long ton (2240 lb) is 101.605% of a tonne
- 110.23% of a short ton
- One short ton (2000 lb) is 90.72% of a tonne
- 32,150.75 troy ounces
References
- ↑ The density of air-free water at a pressure of 1 atmosphere and 3.98 °C is 999.974 kg per cubic metre. September 2001, The International Association for the Properties of Water and Steam Guideline on the Use of Fundamental Physical Constants and Basic Constants of Water
- ↑ Section 4.1 of The International System of Units (SI) (PDF), 8th Edition, 2006