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A troy ounce (abbreviated oz t) is equal to 480 grains. Consequently, the international troy ounce is equal to exactly 31.1034768 grams. There are 12 troy ounces in the now obsolete troy pound. Today, the troy ounce is used only to express the mass of precious metals such as gold, platinum, palladium, rhodium or silver.
The standard British troy pound manufactured in 1758; it bears the abbreviation ℔ ("pound") and the letter "T" for troy. The troy pound (lb t) consists of twelve troy ounces [15] and thus is 5 760 grains (373.241 72 grams). (An avoirdupois pound is approximately 21.53% heavier at 7 000 grains (453.592 37 grams), and consists of sixteen ...
A tower pound is equal to 12 tower ounces and to 5,400 troy grains, which equals around 350 grams. [30] The tower pound is the historical weight standard that was used for England's coinage. [31] Before the Norman conquest in 1066, the tower pound was known as the Saxon pound.
The original mercantile pound of 25 shillings or 15 (Tower) ounces was displaced by, variously, the pound of the Hanseatic League (16 tower ounces) and by the pound of the then-important wool trade (16 ounces of 437 grains). A new pound of 7,680 grains was inadvertently created as 16 troy ounces, referring to the new troy rather than the old ...
In the United Kingdom, 14 avoirdupois pounds equal one stone. The quarter, hundredweight, and ton equal respectively, 28 lb, 112 lb, and 2,240 lb in order for masses to be easily converted between them and stone. The following are the units in the British or imperial version of the avoirdupois system:
sixteenth of an ounce (possibly originated as the weight of silver in Ancient Greek coin drachma) Ounce (oz) ≈28.35 g: 1 oz = 16 dr = 437.5 grains Pound (lb) ≈453.6 g: 1 lb = 16 oz = 7000 grains ('lb' is an abbreviation for the Ancient Roman unit libra) Stone (st) 6.35 kg: 1 st = 14 lb (see Stone (unit) for other values) Quarter (qr) 12.7 kg
For example, in retail commerce, the "net weight" of products actually refers to mass, and is expressed in mass units such as grams or ounces (see also Pound: Use in commerce). Conversely, the load index rating on automobile tires, which specifies the maximum structural load for a tire in kilograms, refers to weight; that is, the force due to ...
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).