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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 ).
The troy weight units are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces). The troy grain is equal to the grain unit of the avoirdupois system, but the troy ounce is heavier than the avoirdupois ounce, and the troy pound is lighter than the avoirdupois pound. Legally, one troy ounce ...
Another difference arose when Britain abolished the troy pound (373.241 7216 g) on 1 January 1879, leaving only the troy ounce (31.103 4768 g) and its decimal subdivisions, whereas the troy pound (of 12 troy ounces) and pennyweight are still legal in the United States, although they are no longer widely used.
ounce: oz oz 1.0 oz (28 g) oz g; drachm: drachm (none) 1.0 drachm (1.8 g) drachm: dram (none) grain: gr gr equivalent to the troy grain 1.0 gr (0.065 g) Troy: troy pound: troy pound (none) 1.0 troy pound (0.82 lb; 0.37 kg) troy ounce: ozt ozt 1.0 ozt (1.1 oz; 31 g) pennyweight: dwt dwt 1.0 dwt (0.055 oz; 1.6 g) grain: gr gr equivalent to the ...
This value was subsequently called the pennyweight and formed the basis of the Troy units of weight—the troy ounce used to this day for weighting precious metals. [ 3 ] : 44–48 Edward I (1272–1307) broke the link between a coin's value and its weight when he debased the English coinage by introducing a groat (four pence) which weighed of ...
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. ... pennyweight ...
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(The London troy pound was referred to as the ' trooisch pond ', after metrification.) The Dutch troy mark consisted [65] of 8 Flemish troy ounces, with each ounce of 20 engels, and each engel divided into 32 assen. The Amsterdam Pound of two marks, used in commerce, weighed 10,280 assen, while the Amsterdam Troy pound weighed 10,240 assen, i.e ...