Ounce (oz, oz avdp)
Ounce (oz, oz avdp) :
An ounce is equal to 437.5 grains, 1/16 of a pound, or 28.350 grams. The system of having 16 ounces in a pound is called the avoirdupois system. Note: (a) An ounce is a unit of weight that is not equal to a fluid ounce which is a measure of volume. (b) The troy or apothecary weight system has one ounce = 480 grains = 31.103 grams and 12 ounces = 1 pound! That means one avoirdupois ounce is equal to 0.910 troy ounce. Yikes!
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