Editing Ton (section)

===Other units of mass/weight===
*'''[[Deadweight tonnage|Deadweight ton]]''' (abbreviation 'DWT' or 'dwt') is a measure of a ship's carrying capacity, including bunker oil, fresh water, ballast water, crew, and provisions. It is expressed in tonnes ({{convert|1,000|kg|lb|0}}) or long tons ({{convert|2,240|lb|kg|0}}). This measurement is also used in the U.S. tonnage of naval ships.
* Increasingly, '''[[tonne]]s''' are being used rather than long tons in measuring the [[Displacement (ship)|displacement of ships]].
*'''Harbour ton''', used in South Africa in the 20th century, was equivalent to ({{convert|2,000|lb|kg|0}}) or 1 short ton.

{{anchor|Assay ton}}
'''Assay ton''' (abbreviation 'AT') is not a unit of measurement but a standard quantity used in [[assay]]ing ores of precious metals. A '''short assay ton''' is approximately {{convert|29.16666|g|abbr=on|adj=ri2|3}} and a '''long assay ton''' is approximately {{convert|32.66666|g|abbr=on|adj=ri2|3}}.<ref>{{Cite book |last=Fenna |first=Donald |title=A Dictionary of Weights, Measures, and Units |publisher=Oxford University Press |year=2002 |isbn=9780198605225 |location=Oxford |at=assay ton}}</ref>{{citation needed|reason=though the different US/UK values are attested, the terms "short" and "long" with "assay ton" seem only to be found in Wikipedia/Wiktionary and derivative online convertors|date=August 2023}} These amounts bear the same ratio to a milligram as a short or long ton bears to a [[troy ounce]]. Therefore, the number of milligrams of a particular metal found in a sample weighing one assay ton gives the number of troy ounces of metal contained in a ton of ore.

In documents that predate 1960 the word ''ton'' is sometimes spelled ''tonne'',{{citation needed|reason=No entry for tonne in SOED|date=June 2018}} but in more recent documents ''tonne'' refers exclusively to the [[metric ton]].

In [[nuclear power plant]]s '''tHM''' and '''MTHM''' mean tonnes of [[heavy metals]], and '''MTU''' means tonnes of [[uranium]]. In the [[steel]] industry, the abbreviation '''THM''' means '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 or specific consumption.

{{vanchor|Dry ton|Dry tonne|Wet ton|Wet tonne|text=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'''.}}