An ounce is a unit of mass commonly used in the United States and other countries that follow the Imperial or US customary systems of measurement. It is abbreviated as oz. One ounce is equivalent to 1/16 of a pound or approximately 28.35 grams.

The ounce is primarily used for measuring the weight of small items such as food products, precious metals, and drugs. In cooking, the ounce is often used to measure ingredients such as flour, sugar, and spices. In the jewelry industry, the ounce is commonly used to measure the weight of gold, silver, and other precious metals.

The ounce is also used in the troy weight system, which is primarily used for weighing precious metals such as gold, silver, and platinum. In the troy weight system, one troy ounce is equal to 31.1034768 grams.

In addition to the standard ounce, there are also several other units of measurement that use the term "ounce" such as the fluid ounce and the troy ounce. The fluid ounce is used for measuring volume in the US customary and Imperial systems, and one fluid ounce is equal to approximately 29.57 milliliters. The troy ounce is used for weighing precious metals and gemstones and is slightly heavier than the standard ounce, with one troy ounce equivalent to 1.09714 ounces.

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