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A pennyweight (dwt) is a unit of mass equal to 24 grains, 1 ⁄ 20 of a troy ounce, 1 ⁄ 240 of a troy pound, approximately 0.054857 avoirdupois ounce [1] and exactly 1.55517384 grams. [2] It is abbreviated dwt , d standing for denarius – (an ancient Roman coin), and later used as the symbol of an old British penny (see £sd ).
Troy weight is a system of units of mass that originated in the Kingdom of England in the 15th century [1] and is primarily used in the precious metals industry. The troy weight units are the grain , the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces).
Gold fineness in carats comes from carats and grains of gold in a solidus of coin. The conversion rates 1 solidus = 24 carats, 1 carat = 4 grains still stand. [ 16 ] Woolhouse's Measures, Weights and Moneys of All Nations [ 17 ] gives gold fineness in carats of 4 grains, and silver in troy pounds [ 17 ] of 12 troy ounces of 20 pennyweight each.
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The Manners and Customs of Ireland lists two types of unge: unge mór at 20 pennyweights (31.1 g) and unge beg at 10 pennyweights (15.6 g). [2] A screpall óir (gold scruple) was used for measuring gold weight and was equal to a quarter-ounce (7 g). [3]
Deadweight tonnage (also known as deadweight; abbreviated to DWT, D.W.T., d.w.t., or dwt) or tons deadweight (DWT) is a measure of how much weight a ship can carry. [ 1 ] [ 2 ] [ 3 ] It is the sum of the weights of cargo , fuel, fresh water , ballast water , provisions, passengers, and crew .
See Weight for detail of mass/weight distinction and conversion. Avoirdupois is a system of mass based on a pound of 16 ounces, while Troy weight is the system of mass where 12 troy ounces equals one troy pound. The symbol g 0 is used to denote standard gravity in order to avoid confusion with the (upright) g symbol for gram.
The tola formed the base for units of mass under the British Indian system, and was also the standard measure of gold and silver bullion. [1] Although the tola has been officially replaced by metric units since 1956, [ 8 ] it is still in current use, and is a popular denomination for gold bullion bars in Bangladesh , India , Nepal , Pakistan ...