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why do we use oz for ounces

Most of our abbreviations for units of measurements are pretty straightforward. They are made up of of letters from the words they stand for. So how do we get
lb for "pound" and oz for "ounce"? Lb is an abbreviation of the Latin word libra. The primary meaning of libra was balance or scales (as in the astrological sign), but it also stood for the ancient Roman unit of measure libra pondo, meaning "a pound by weight. " We got the word "pound" in English from the pondo part of the libra pondo but our abbreviation comes from the libra. The libra is also why the symbol for the British pound is бе Б an L with a line through it. The Italian lira also used that symbol (with two lines through it), the word "lira" itself being a shortened version of libra. "Ounce" is related to the Latin uncia, the name for both the Roman ounce and inch units of measurement.

The word came into English from Anglo-Norman French, where it was unce or ounce, but the abbreviation was borrowed from Medieval Italian, where the word was onza. These days the Italian word is oncia, and the area once covered by the Roman Empire has long since switched to the metric system. Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but different standards of mass. The international avoirdupois ounce is defined as exactly 28. 349523125Pg under the agreement of 1959, signed by the United States and countries of the.

In the system, sixteen ounces make up an, and the avoirdupois pound is defined as 7000 ; one avoirdupois ounce is therefore equal to 437. 5 grains. The ounce is still a standard unit in the United States, but in the it is now mainly used informally. However even though it ceased to be a legal unit of measure in Britain in 2000 it is used in restaurants to describe steak or burger portion sizes. A is equal to 480. Consequently, the international troy ounce is equal to exactly 31. 1034768Pgrams. There are 12 troy ounces in the now obsolete. Today, the troy ounce is used only to express the mass of precious metals such as, or. are the most common products produced and marketed in troy ounces, but precious metal bars also exist in gram and kilogram (kg) sizes. (A kilogram bullion bar contains 32. 15074657 troy ounces. ) For historical measurement of gold, a fine ounce is a troy ounce of pure gold content in a gold bar, computed as a standard ounce is a troy ounce of 22 gold, 91. 66% pure (an 11 to 1 proportion of gold to Some countries have redefined their ounces in the.

For example, the German apothecaries ounce of 30 grams, is very close to the previously widespread Nuremberg ounce, but the divisions and multiples come out in metric. In 1820, the Dutch redefined their ounce (in, ons ) as 100. Dutch amendments to the metric system, such as an ons or 100Pgrams, has been inherited, adopted, and taught in beginning in elementary school. It is also listed as in Indonesia's national dictionary, the, and the government's official elementaryschool curriculum.

The obsolete ounce (abbreviated ) equivalent to the troy ounce, was formerly used by. "Maria Theresa ounce" was once introduced in Ethiopia and some European countries, which was equal to the weight of one, or 28. 0668 g. Both the weight and the value are the definition of one birr, still in use in present-day Ethiopia and formerly in Eritrea. [ The Spanish pound ( libra ) was 460 g. The Spanish ounce (Spanish onza of a pound, i. e. 28. 75 g. The Tower ounce of 450 grains was used in the English mints, the principal one being in the Tower of London. It dates back to the Anglo-Saxon coinage weight standard. It was abolished in favour of the Troy ounce by Henry VIII in 1527. [

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