A Troy ounce is heavier because there are only 14.58333 Troy ounces in a pound whereas the "normal" (avoirdupois) ounces are 16 in a pound.
1 lb. = 16 oz. Avoirdupois
1 lb. = 7000 grains
1 ounce Troy = 480 grains
7000 / 480 = 14.58333 ounces Troy per 1 lb.
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".999 silver" does not signify the weight. It signifies the purity. .999 is the same as 99.9%. But silver bullion comes in half-troy oz rounds, 1 troy oz rounds or bars, 5, 10, 12, 20, 50, 100, and 1000 troy oz bars. 12 troy oz=1 troy lb. 1 troy oz=31.1034768 g, as opposed to the oz, which weighs 28.3495231 g.
1 pound = 14.5833333 troy oz
1 Troy Oz = 0.0311034768 Kilograms 1 Kilogram = 32.1507465686 Troy Ozso one gold troy ounce = 31.1034768 grams
1 gram = 0.0321507466 troy oz
1 troy oz = 31.1 grams.