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Units of mass are standard measurements used to quantify the amount of matter in an object or substance. The most commonly used units of mass are: 1. **Kilogram (kg)**: The base unit of mass in the International System of Units (SI). It is defined as the mass of a specific platinum-iridium cylinder kept at the International Bureau of Weights and Measures. 2. **Gram (g)**: A subunit of the kilogram, where 1 kilogram equals 1000 grams.

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