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The hundredweight (abbreviation: cwt), formerly also known as the centum weight or quintal, is an English, imperial, and US customary unit of weight or mass of various values. Its present value continues to differ between the American and imperial systems. The two values are distinguished in American English as the "short" and "long" hundredweight and in British English as the "cental" and the "hundredweight". * The short hundredweight or cental of 100 lb (45.359237 kg) is used in the US〔(NIST Guide to the SI ).〕 and Canada. * The long or imperial hundredweight of 8 stone (112 lb or 50.802345 kg) sees informal use in the imperial system〔, which reiterates for hundredweight the .〕 but was banned from commercial use in 1985. Under both conventions, there are 20 hundredweight in a ton, producing a "short ton" of 2000 lb and a "long ton" of 2240 lb. ==History== The hundredweight has had many different values. In England in around 1300, various different "hundreds" (''centem'' in Medieval Latin) were defined. The Weights and Measures Act of 1835 formally established the present imperial hundredweight of 112 lb. The use in trade of measures by "cental", "hundredweight", or "quintal" have now been banned in the United Kingdom under the Weights and Measures Act of 1985. The United States and Canada came to use the term "hundredweight" to refer to a unit of 100 lb. This measure was specifically banned from British use—upon risk of being sued for fraud—by the Weights and Measures Act of 1824 but, in 1879, the measure was legalized under the name "cental" in response to legislative pressure from British merchants importing wheat and tobacco from the United States.〔Chapter VII of the book ''Men and measures: a history of weights and measures, ancient and modern'', by Edward Nicholson (published 1912). (Downloadable at Archive.org ).〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hundredweight」の詳細全文を読む スポンサード リンク
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