A microgram is a unit of mass in the metric system, symbolized as "µg." It is equal to one millionth of a gram (1 µg = 0.000001 grams) or one billionth of a kilogram (1 µg = 0.000000001 kg). Micrograms are commonly used in fields such as medicine, biology, and chemistry to measure very small quantities of substances, such as vitamins, drugs, or pollutants.
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