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How many ounces are in a troy ounce?

  1. 32.0

  2. 28.3

  3. 31.1

  4. 30.0

The correct answer is: 31.1

A troy ounce is defined as approximately 31.1 grams, which is the correct conversion. This standard measurement is primarily used for precious metals like gold, silver, and platinum. The troy ounce is part of a system known as the troy weight system, which dates back to medieval times and remains in use today in the precious metals market. The other options presented relate to different weight measurements and systems, such as the avoirdupois ounce, which is commonly used in the United States for everyday goods. Hence, while they may represent valid weight units, they do not pertain to the troy ounce definition. The specific weight of a troy ounce being 31.1 grams is a well-established fact in both industry and trade, making it essential knowledge for anyone involved in auctioning or dealing with precious metals.