Ton

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.(mainly UK)Used worldwide. 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. It is derived from the tun, the term applied to a cask of the largest capacity. This could contain a volume between 175 and 213 imperial gallons (210 and 256 US gal; 800 and 970 l), which could weigh around 2,000 pounds (910 kg) and occupy some 60 cubic feet (1.7 m3) of space. In the United Kingdom the (Imperial) ton was formerly a unit of Statute measure, defined as 2,240 lb (1,016 kg) From 1965 the UK embarked upon a programme of metrication and gradually introduced metric units, including the tonne (metric ton), defined as 1,000 kg (2,205 lb). The UK Weights and Measures Act 1985 explicitly excluded many units and terms from 'use for trade', including the ton (and the term 'metric ton' for 'tonne'). In the United States and Canada a ton is defined to be 2,000 pounds (907 kg). Where confusion is possible, the 2240 lb ton is called 'long ton' and the 2000 lb ton 'short ton'; the tonne is distinguished by its spelling, but usually pronounced the same as ton, hence the US term 'metric ton'. In the UK the final 'e' of 'tonne' can also be pronounced (/ˈtʌni/), or 'metric ton' when it is necessary to make the distinction.