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Troy

usgb/trɔɪ/Volume
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Precise MeasurementPlay
The troy system is used for accuracy in measuring precious items. SlideThe jeweler measured the diamonds in troy carats.
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Specific UsagePlay
Troy is not used for everyday items like groceries or postage. SlideHe knew not to use troy weight for measuring flour.
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Not for PeoplePlay
The troy system applies to objects, not quantifying people or animals. SlideYou wouldn't say, 'She weighs 120 troy ounces.'