One avdp ounce equates to 0.911458 troy ounces.
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Gold and other precious metals are usually weighed in the Troy weight system. The system used in the US is called the avoirdupois weight system or (avdp) where sixteen ounces equals one pound. A pound (avdp) is equal to 1.21528338 Troy pounds. One Troy ounce of gold weighs 1.0971377 ounce (avdp) and there are 12 Troy ounces in one Troy pound and only 0.822853347 pounds (avdp) in a Troy pound. Be extremely careful when you buy gold by the Ton to always know that both you and the seller are talking the same measurement short long or metric Ton. It could be an expensive error.
A silver round marked 16 avdp oz 999 means it weighs 16 troy ounces and has a purity of 99.9%. The weight should be around 500 grams or approximately 1.1 pounds. It is measured in troy ounces, not avoirdupois ounces like pounds.
There are 2.0125 pounds in 32.15 troy ounces.
"Tri-ounce" is not a standard unit of measurement. If you meant to ask about "three ounces," then there are three ounces in three ounces.
One ounce is equivalent to 0.911 troy ounces. This is because a troy ounce is slightly heavier than a standard (avoirdupois) ounce commonly used in the United States.