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Troy Ounce

This is a measurement used today primarily  for weighing precious metals such as gold and  silver.

One Troy  ounce  equals  31.1034768  grams. A normal ounce equals 1/16th of a pound in weight,  but the Troy ounce is only 1/12th of a pound.  The measurement became standardised in 1758 as a weight  measurement of distilled  water!  Whenever you see the price of gold or silver  being mentioned on the news or in newspapers,  it is usually the price of a Troy ounce that is  being detailed.

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