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At that time a "tun" was a wine container of 252 wine gallons, approx 210 imp gal (955 L) weighing about 2,240 lb (1,020 kg), a weight known today as a long ton or imperial ton. In order to estimate the capacity of a ship in terms of 'tun' for tax purposes, an early formula used in England was:
ton, assay (long) AT ≡ 1 mg × 1 long ton ÷ 1 oz t = 32. 6 g ton, assay (short) AT ≡ 1 mg × 1 short ton ÷ 1 oz t = 29.1 6 g ton, long: long tn or ton ≡ 2240 lb = 1 016.046 9088 kg: ton, short: sh tn ≡ 2000 lb = 907.184 74 kg: tonne (mts unit) t ≡ 1000 kg = 1000 kg: wey: ≡ 252 lb = 18 st = 114.305 277 24 kg (variants exist ...
Ton is any of several units of measure of mass, volume or force. It has a long history and has acquired several meanings and uses. As a unit of mass, ton can mean: the long ton, which is 2,240 pounds (1,016.0 kilograms) the tonne, also called the metric ton, which is 1,000 kilograms (about 2,204.6 pounds) or 1 megagram.
The tonne (/ t ʌ n / ⓘ or / t ɒ n /; symbol: t) is a unit of mass equal to 1,000 kilograms.It is a non-SI unit accepted for use with SI.It is also referred to as a metric ton in the United States to distinguish it from the non-metric units of the short ton (United States customary units) and the long ton (British imperial units).
Net tonnage is used to calculate the port duties and should not be taken as less than 30 per cent of the ship's gross tonnage. [2] Net tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as deadweight tonnage or displacement. Also, unlike the net register tonnage, the net tonnage is ...
A ton-force is one of various units of force defined as the weight of one ton due to standard gravity. [ note 1 ] The precise definition depends on the definition of ton used. Tonne-force
A long ton, also called the weight ton (W/T), [1] imperial ton, or displacement ton, is equal to: . 2,240 pounds (1,016.0 kilograms; 1.0160 metric tons) exactly 12% more than the 2,000 pounds of the North American short ton, being 20 long hundredweight (112 lb) rather than 20 short hundredweight (100 lb)
The gross tonnage calculation is defined in Regulation 3 of Annex 1 of The International Convention on Tonnage Measurement of Ships, 1969. [3] It is based on two variables, and is ultimately an increasing one-to-one function of ship volume: