Ton
Ton - Wikipedia, the free encyclopedia
For other uses, see Ton (disambiguation) ... The long ton is used for petroleum products such as aviation fuel. Deadweight ton (abbreviation 'DWT' or 'dwt') is ...
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ton: Definition from Answers.com
ton n. ( Abbr. t. or tn. ) A unit of weight equal to 2,000 pounds (0.907 metric ton or 907.18 kilograms) ... US Military Dictionary: ton ...
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ton - Wiktionary
A unit of volume; register ton. ... I've got a ton of work to do. (slang) A speed of 100 mph. (slang) One hundred pounds sterling. ...
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Tonne - Wikipedia, the free encyclopedia
(Redirected from Metric ton) Jump to: navigation, search ... A tonne (t) or metric ton, also referred to as a metric tonne or tonne métrique, ...
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ton - Definition from the Merriam-Webster Online Dictionary
Definition of ton from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.
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Units of mass There are three similar units of mass called the ton:
- In the iron industry in the 17th century and 18th century, a ton shortweight was the standard 2240 lb., whereas a ton longweight was 2400 lb. (the hundredweight being 120 lb.)
- The long ton is used for petroleum products such as aviation fuel.
- Deadweight ton (abbreviation 'dwt') is a measure of a ship's carrying capacity, including bunker oil, fresh water, crew and provisions. It is expressed in metric tons (1,000 kg) or long tons (2,240 pounds, about 1,016 kg). This measurement is also used in the U.S. tonnage of naval ships.
- Increasingly, metric tonnes are being used rather than long tons in measuring the displacement of ships. See tonnage.
- Harbour ton used in South Africa in the 20th century, equal to 2000 pounds or one short ton.
Both the long ton and the short ton are composed of twenty hundredweights, each having different values for the hundredweight (112 and 100 pounds respectively). Prior to the 15th century in England, the ton was composed of 20 hundredweights, each of 108 lb, giving a ton of 2160 pounds.
Assay ton (abbreviation 'AT') is not a unit of measurement (nobody ever has x assay tons of something), but rather a standard quantity used in assaying ores of precious metals; it is 29 1/6 grams (short assay ton) or 32 2/3 grams (long assay ton), the amount which bears the same ratio to a milligram as a short/long ton bears to a troy ounce. In other words, the number of milligrams of a particular metal found in a sample of this size gives the number of troy ounces contained in a short/long ton of ore.
In documents which predate 1960 the word ton may be spelt tonne, however in more recent documents the spelling tonne refers exclusively to the metric tonne.
In the context of nuclear power plants, tHM and MTHM mean (metric) tonnes of Heavy metals, and MTU means metric tonnes of uranium. In the steel industry, the acronym THM has the meaning 'tons/tonnes hot metal', which refers to the amount of liquid iron or steel that is produced (particularly in the context of blast furnace production/specific consumption).
A dry ton or dry tonne has the same mass value, but the material (sludge, slurries, compost, and similar mixtures in which solid material is soaked with or suspended in water) has been dried to a relatively low, consistent moisture level (dry weight). If the material is in its natural, wet state, it is called a wet ton or wet tonne.
Common abbreviations In the U.S. mining industry, 'T' is used to distinguish the traditional ton from the metric ton, but 'T' is also the SI symbol for the tesla. The symbol 't', traditionally used for the long or short ton, is now reserved for the metric tonne.
Units of force There are also the units of force based on each of these three mass units, but none are acceptable for use with SI. The tonne force, like the kilogram force, is no exception. Only the tonne as a unit of mass is acceptable for use with SI.
- 1 short ton force = 2000 pound-force (lbf) = 8.896443230521 kilonewtons (kN)
- 1 long ton force = 2240 lbf = 9.96401641818352 kN
- 1 tonne force = 1000 kilogram-force = 9.80665 kN
Units of volume Also see tonnage.
The freight ton or measurement ton is a unit of volume used for describing ship capacities (tonnage) or cargo. One measurement ton is equal to:
- 40 cubic foot
- 1.481(481) cubic yards (the "481" digit sequence repeats infinitely)
- 1,132.67386368 litres
- 1.13267386368 cubic metres
The measurement ton is abbreviated as M/T, MT, or MTON, which can cause it to be confused with the tonne.
The register ton is also a unit of volume used for the cargo capacity of a ship, defined as 100 cubic feet (roughly 2.83 cubic metres). It is often abbreviated GRT for gross registered ton. It is known as a tonneau de mer in Belgium, but, in France, a tonneau de mer is 1.44 cubic metres or about 1.88 cubic yards.
The Panama Canal net ton, a unit of volume used for billing for ships going through the Panama Canal, is the same as the register ton. The fee for example in the 1990s was roughly a couple USD for each unit.
The water ton was formerly used in Great Britain and equal to 224 imperial gallons (the volume occupied by a mass of one long ton under the conditions which define the imperial gallon).
See 1 E-1 m³ and orders of magnitude (volume) for a comparison with other volumes.
(Note that volume tons are units of convenience used in shipping and are not useful in science except that they are exactly defined.)
Units of energy and power Ton of TNT
- A ton of TNT or tonne of TNT is a unit of energy equal to 109 (thermochemical) calories, also known as a gigacalorie (gigacalorie), equal to 4.184 gigajoules (gigajoule).
- A kiloton of TNT or kilotonne of TNT is a unit of energy equal to 1012 calories, also known as a teracalorie (teracalorie), equal to 4.184 terajoules (terajoule).
- A megaton of TNT (1,000,000 metric tonnes) or megatonne of TNT is a unit of energy equal to 1015 calories, also known (infrequently) as a petacalorie (petacalorie), equal to 4.184 petajoules (petajoule).
Note that these are small calories (cal). The dietary Calorie (Cal) is distinct and equal to one kilocalorie.
Early values for the explosive energy released by trinitrotoluene (TNT) ranged from 900 to 1100 calories per gram. In order to standardise the use of the term TNT as a unit of energy, an arbitrary value was assigned based on 1000 calories (1 kcal, 4.184 kilojoules) per gram. Thus there is no longer a direct connection to the chemical TNT itself. It is now merely a unit of energy that happens to be expressed using words normally associated with mass (e.g. kilogram, tonne, pound) (IAEA references: , ). The definition applies for both spellings: ton of TNT and tonne of TNT.
Measurements in tons of TNT have been used primarily to express nuclear weapon yields, though they have also been used since in seismology as well.
ton of coal equivalent
- A ton of coal equivalent or tonne of coal equivalent (TCE), a conventional value of 7 Gcal (IT) = 29.3076 GJ.
ton of oil equivalent
- A ton of oil equivalent or tonne of oil equivalent (TOE), a conventional value of 10 Gcal (IT) = 41.868 GJ ≈ 10.0067 ton of TNT. See also GTOE.
Refrigeration ton The unit ton is used in refrigeration and air-conditioning to measure heat absorption. Prior to the introduction of mechanical refrigeration, cooling was accomplished by delivering ice. Installing one ton of refrigeration replaced the daily delivery of one ton of ice.
- In the United States, a standard ton of refrigeration = 12,000 BTU/h = 200 BTU/min ≈ 3,517 watt. It is approximately the power required to cool 1 short ton of water by 1 Fahrenheit every 10 minutes; or the power required to melt one short ton (2,000 pound (mass)) of ice at 0 °C in 24 hours.
- A ton is also a unit of energy equal to that power for a period of a day, or 24 h × 12,000 BTU/h = 288,000 BTU ≈ 303.9 megajoules.
- A less common usage is the power required to cool 1 long ton of water by 1 °F every 10 minutes = 13,440 BTU/h ≈ 3,939 watt.
Marks' Standard handbook for Mechanical Engineers, 8th Ed., McGraw Hill, p. 19-3
Truck classes When the light duty trucks were first produced, they were rated by their payload capacity in tons (e.g. 1/2-, 3/4-, & 1-ton). The Ford F-150, Chevy/GMC 1500, & Dodge 1500 are a 1/2-ton. The Ford F-250, Chevy/GMC 2500, & Dodge 2500 are a 3/4-ton. The Ford F-350, Chevy/GMC 3500, & Dodge 3500 are a 1-ton. But throughout the years, the payload capacities have increased while the ton title has stayed the same. The current ton rating is nothing more than just a truck name.
Miscellaneous tons
- Ton is also used informally to mean a large amount of something (material or not), for example, "We've been having a ton of good luck recently".
- The ton meant the upper levels of London society in the English Regency period. Ton comes from the French word meaning tone, as used in the phrase bon ton - good manners and fashionable style.
- In Britain, ton is colloquially used to refer to 100 of a given unit. Ton can thus refer to the speed of motor vehicles, namely to the speed of 100 miles per hour e.g. "Lee was doing a ton down the motorway", to money e.g. "How much did you pay for that?" "A ton" (=£100), to 100 points in a game e.g. "Eric just threw a ton in our darts game" or to a hundred of pretty much anything else.
A ton is also equivalent to 100 runs in the game of cricket.
See also
- Conversion of units
- Medieval weights and measures
- Ancient weights and measures
- English unit
- Imperial unit
- U.S. customary unit
References
Ton - Wikipedia, the free encyclopedia
edit] Units of mass. There are three similar units of mass called the ton: long ton (simply ton in countries such as the United Kingdom which formerly used the Imperial system of ...
Definition: ton from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
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