One tonne is equal to 1000 kilograms or 1 megagram
|Unit system||Non-SI unit accepted for use with SI|
|In SI base units:||1 t = 1000 kg = 1 Mg|
The tonne ( // (
This is a list of units that are not defined as part of the International System of Units (SI), but are otherwise mentioned in the SI, because either the General Conference on Weights and Measures (CGPM) accepts their use as being multiples or submultiples of SI-units, they have important contemporary application worldwide, or are otherwise commonly encountered worldwide.
Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.
The kilogram or kilogramme is the base unit of mass in the International System of Units (SI). Until 20 May 2019, it remains defined by a platinum alloy cylinder, the International Prototype Kilogram, manufactured in 1889, and carefully stored in Saint-Cloud, a suburb of Paris. After 20 May, it will be defined in terms of fundamental physical constants.
The tonne is derived from the mass of one cubic metre of pure water; one thousand litres of pure water has an absolute mass of one tonne.
The cubic metre or cubic meter is the SI derived unit of volume. Its SI symbol is m3. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with metric prefixes, was the stère, still sometimes used for dry measure. Another alternative name, no longer widely used, was the kilolitre.
The litre or liter is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm3), 1,000 cubic centimetres (cm3) or 1/1,000 cubic metre. A cubic decimetre occupies a volume of 10 cm×10 cm×10 cm and is thus equal to one-thousandth of a cubic metre.
The SI symbol for the tonne is 't', adopted at the same time as the unit in 1879.It is a symbol, not an abbreviation, and should not be followed by a period. Use of majuscule and minuscule letter case is significant, and use of other letter combinations is not permitted and would lead to ambiguity. For example, 'T', 'MT', 'Mt', 'mt' are the SI symbols for the tesla, megatesla, megatonne (one teragram) and millitonne (one kilogram) respectively. If describing TNT equivalent units of energy, this is equivalent to 4.184 petajoules.
The International System of Units is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units, which are the ampere, kelvin, second, metre, kilogram, candela, mole, and a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system also specifies names for 22 derived units, such as lumen and watt, for other common physical quantities.
The tesla is a derived unit of the magnetic induction in the International System of Units.
TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. The "ton of TNT" is a unit of energy defined by that convention to be 4.184 gigajoules, which is the approximate energy released in the detonation of a metric ton of TNT. In other words, for each gram of TNT exploded, 4,184 joules of energy are released.
In French and most varieties of English (the exceptions being American and occasionally Canadian English), tonne is the correct spelling. It is usually pronounced the same as ton // , but when it is important to clarify that the metric term is meant, rather than short ton, the final "e" can also be pronounced, i.e. "tonny" // . In Australia, it is also pronounced // .
American English, sometimes called United States English or U.S. English, is the set of varieties of the English language native to the United States. It is considered one of the most influential dialects of English globally, including on other varieties of English.
Canadian English is the set of varieties of the English language native to Canada. According to the 2011 census, English was the first language of approximately 19 million Canadians, or 57% of the population; the remainder of the population were native speakers of Canadian French (22%) or other languages. A larger number, 28 million people, reported using English as their dominant language. 82% of Canadians outside the province of Quebec reported speaking English natively, but within Quebec the figure was just 7.7% as most of its residents are native speakers of Quebec French.
Before metrication in the UK the unit used for most purposes was the Imperial ton of 2,240 pounds avoirdupois or 20 hundredweight (usually referred to as the long ton in the US), equivalent to 1,016 kg, differing by just 1.6% from the tonne. The UK Weights and Measures Act 1985 explicitly excluded from use for trade certain imperial units, including the ton, unless the item being sold or the weighing equipment being used was weighed or certified prior to 1 December 1980, and even then only if the buyer was made aware that the weight of the item was measured in imperial units. [ full citation needed ]
Metrication in the United Kingdom, the process of introducing the metric system of measurement in place of imperial units, has made steady progress since the mid–20th century but today remains equivocal and varies by context. Most of government, industry and commerce use metric units, but imperial units are officially used to specify journey distances, vehicle speeds and the sizes of returnable milk containers, beer and cider glasses. Imperial units are also often used to describe body measurements and vehicle fuel economy. In schools metric units are taught and used as the norm and imperial units that remain in common usage in the UK must also be taught.
The hundredweight, formerly also known as the centum weight or quintal, is an English, imperial, and US customary unit of weight or mass of various values. Its value differs between the American and imperial systems. The two values are distinguished in American English as the "short" and "long" hundredweight and in British English as the "cental" and the "imperial hundredweight".
Long ton, also known as the imperial ton or displacement ton, is the name for the unit called the "ton" in the avoirdupois system of weights or Imperial system of measurements. It was standardised in the thirteenth century and is used in the United Kingdom and several other British Commonwealth of Nations countries alongside the mass-based metric tonne defined in 1799.
In the United States metric ton is the name for this unit used and recommended by NIST; 2,000 pounds (907 kg), and tonne is rarely used in speech or writing. Both spellings are acceptable in Canadian usage.an unqualified mention of a ton almost invariably refers to a short ton of
The short ton is a unit of mass equal to 2,000 pounds-mass. The unit is most commonly used in the United States where it is known simply as the ton.
Ton and tonne are both derived from a Germanic word in general use in the North Sea area since the Middle Ages (cf. Old English and Old Frisian tunne, Old High German and Medieval Latin tunna, German and French tonne) to designate a large cask, or tun. kg if full of pure water, a little less for wine.A full tun, standing about a metre high, could easily weigh a tonne. An English tun (an old wine cask volume measurement equivalent to nine hundred, and fifty-four litres) of wine has a relative mass of one tonne, nine hundred, and fifty-four
The spelling tonne pre-dates the introduction of the SI in 1960; it has been used with this meaning in France since 1842,when there were no metric prefixes for multiples of 106 and above, and is now used as the standard spelling for the metric mass measurement in most English-speaking countries. In the United States, the unit was originally referred to using the French words millier or tonneau, but these terms are now obsolete. The Imperial and US customary units comparable to the tonne are both spelled ton in English, though they differ in mass.
One tonne is equivalent to:
For multiples of the tonne, it is more usual to speak of thousands or millions of tonnes. Kilotonne, megatonne, and gigatonne are more usually used for the energy of nuclear explosions and other events in equivalent mass of TNT, often loosely as approximate figures. When used in this context, there is little need to distinguish between metric and other tons, and the unit is spelt either as ton or tonne with the relevant prefix attached.
|Multiple||Name||Symbol||Multiple||Name||Symbol||Tonnes (t)||Kilograms (kg)||Grams (g)||US/short tons (ST)†||Imperial/long tons (LT)†|
|100||tonne||t||106||megagram||Mg||1 t||1,000 kg||1 million g||1.1023 ST||0.98421 LT|
|103||kilotonne||ktǂ||109||gigagram||Gg||1,000 t||1 million kg||1 billion g||1,102.3 ST||984.21 LT|
|106||megatonne||Mt||1012||teragram||Tg||1 million t||1 billion kg||1 trillion g||1.1023 million ST||984,210 LT|
|109||gigatonne||Gt||1015||petagram||Pg||1 billion t||1 trillion kg||1 quadrillion g||1.1023 billion ST||984.21 million LT|
|1012||teratonne||Tt||1018||exagram||Eg||1 trillion t||1 quadrillion kg||1 quintillion g||1.1023 trillion ST||984.21 billion LT|
|1015||petatonne||Pt||1021||zettagram||Zg||1 quadrillion t||1 quintillion kg||1 sextillion g||1.1023 quadrillion ST||984.21 trillion LT|
|1018||exatonne||Et||1024||yottagram||Yg||1 quintillion t||1 sextillion kg||1 septillion g||1.1023 quintillion ST||984.21 quadrillion LT|
*The equivalent units columns use the short scale large-number naming system currently used in most English-language countries, e.g. 1 billion = 1,000 million = 1,000,000,000.
†Values in the equivalent short and long tons columns are rounded to five significant figures, see Conversions for exact values.
ǂThough non-standard, the symbol "kt" is also used for knot, a unit of speed for aircraft and sea-going vessels, and should not be confused with kilotonne.
A metric ton unit (mtu) can mean 10 kilograms (22 lb) within metal (e.g. tungsten, manganese) trading, particularly within the US. It traditionally referred to a metric ton of ore containing 1% (i.e. 10 kg) of metal. The following excerpt from a mining geology textbook describes its usage in the particular case of tungsten:
"Tungsten concentrates are usually traded in metric tonne units (originally designating one tonne of ore containing 1% of WO3, today used to measure WO3 quantities in 10 kg units. One metric tonne unit (mtu) of tungsten (VI) contains 7.93 kilograms of tungsten." (Walter L Pohl, Economic Geology: Principles and Practices, English edition, 2011, p 183.)
Note that tungsten is also known as wolfram and has the atomic symbol W.
In the case of uranium, the acronym MTU is sometimes considered to be metric ton of uranium, meaning 1,000 kg.
A gigatonne is a unit of mass often used by the coal mining industry to assess and define the extent of a coal reserve.
The tonne of trinitrotoluene (TNT) is used as a proxy for energy, usually of explosions (TNT is a common high explosive). Prefixes are used: kiloton(ne), megaton(ne), gigaton(ne), especially for expressing nuclear weapon yield, based on a specific combustion energy of TNT of about 4.2 MJ/kg (or one thermochemical calorie per milligram). Hence, 1 t TNT = 4.2 GJ, 1 kt TNT = 4.2 TJ, 1 Mt TNT = 4.2 PJ.
The SI unit of energy is the joule. Assuming that a TNT explosion releases 1,000 small (thermochemical) calories per gram (4.2 kJ/g), one tonne of TNT is equivalent to 4.2 gigajoules.
In the petroleum industry the tonne of oil equivalent (toe) is a unit of energy: the amount of energy released by burning one tonne of crude oil, approximately 42 GJ. There are several slightly different definitions. This is ten times as much as a tonne of TNT because atmospheric oxygen is used.
Like the gram and the kilogram, the tonne gave rise to a (now obsolete) force unit of the same name, the tonne-force, equivalent to about 9.8 kilonewtons: a unit also often called simply "tonne" or "metric ton" without identifying it as a unit of force. In contrast to the tonne as a mass unit, the tonne-force or metric ton-force is not acceptable for use with SI, partly because it is not an exact multiple of the SI unit of force, the newton.
The Corporation shall pay to producers selling and delivering wheat produced in the designated area to the Corporation the following sums certain per tonne basis...
The joule is a derived unit of energy in the International System of Units. It is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre. It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).
The pound or pound-mass is a unit of mass used in the imperial, United States customary and other systems of measurement. Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.45359237 kilograms, and which is divided into 16 avoirdupois ounces. The international standard symbol for the avoirdupois pound is lb; an alternative symbol is lbm, #, and ℔ or ″̶.
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit. While all metric prefixes in common use today are decadic, historically there have been a number of binary metric prefixes as well. Each prefix has a unique symbol that is prepended to the unit symbol. The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. The prefix milli-, likewise, may be added to metre to indicate division by one thousand; one millimetre is equal to one thousandth of a metre.
The ton is a unit of measure. It has a long history and has acquired a number of meanings and uses over the years. It is used principally as a unit of mass. Its original use as a measurement of volume has continued in the capacity of cargo ships and in terms such as the freight ton. It can also be used as a measure of energy, for truck classification, or as a colloquial term.
United States customary units are a system of measurements commonly used in the United States. The United States customary system developed from English units which were in use in the British Empire before the U.S. became an independent country. However, the United Kingdom's system of measures was overhauled in 1824 to create the imperial system, changing the definitions of some units. Therefore, while many U.S. units are essentially similar to their Imperial counterparts, there are significant differences between the systems.
The mole is the base unit of amount of substance in the International System of Units (SI). Effective 20 May 2019, the mole is defined as the amount of a chemical substance that contains exactly 6.02214076×1023 (Avogadro constant) constitutive particles, e.g., atoms, molecules, ions or electrons.
The metric system is an internationally recognised decimalised system of measurement. It is in widespread use, and where it is adopted, it is the only or most common system of weights and measures. It is now known as the International System of Units (SI). It is used to measure everyday things such as the mass of a sack of flour, the height of a person, the speed of a car, and the volume of fuel in its tank. It is also used in science, industry and trade.
The pound of force or pound-force is a unit of force or weight used in some systems of measurement including English Engineering units and the British Gravitational System. Pound-force should not be confused with foot-pound, a unit of energy, or pound-foot, a unit of torque, that may be written as "lbf⋅ft"; nor should these be confused with pound-mass, often simply called pound, which is a unit of mass.
To help compare different orders of magnitude, the following lists describe various mass levels between 10−40 kg and 1053 kg.
The kilogram-force, or kilopond, is a gravitational metric unit of force. It is equal to the magnitude of the force exerted on one kilogram of mass in a 9.80665 m/s2 gravitational field. Therefore, one kilogram-force is by definition equal to 9.80665 N. Similarly, a gram-force is 9.80665 mN, and a milligram-force is 9.80665 μN. One kilogram-force is approximately 2.204622 pound-force.
A system of measurement is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Systems of measurement in use include the International System of Units (SI), the modern form of the metric system, the imperial system, and United States customary units.
The foot–pound–second system or FPS system is a system of units built on three fundamental units: the foot for length, the (avoirdupois) pound for either mass or force, and the second for time.
The units of transportation measurement describes the unit of measurement used to measure the quantity and traffic of transportation used in transportation statistics, planning, and their related fields.
The metric system was developed during the French Revolution to replace the various measures previously used in France. The metre is the unit of length in the metric system and was originally based on the dimensions of the earth, as far as it could be measured at the time. The litre, is the unit of volume and was defined as one thousandth of a cubic metre. The metric unit of mass is the kilogram and it was defined as the mass of one litre of water. The metric system was, in the words of French philosopher Marquis de Condorcet, "for all people for all time".
The imperial system of measurement and the US customary system of measurement are both derived from an earlier English system of measurement which in turn can be traced back to Ancient Roman units of measurement, and Carolingian and Saxon units of measure.