Which unit is defined as one millionth of a meter?

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Multiple Choice

Which unit is defined as one millionth of a meter?

Explanation:
Understanding metric prefixes helps you compare lengths quickly. The prefix micro- denotes 10^-6, meaning one part in a million. A micrometer, written μm, thus equals 10^-6 meters. That's why this unit is defined as one millionth of a meter. For comparison, a nanometer is 10^-9 m, a millimeter is 10^-3 m, and a centimeter is 10^-2 m. In biology, many cells and bacteria fall into the micrometer range, illustrating the practical scale of this unit.

Understanding metric prefixes helps you compare lengths quickly. The prefix micro- denotes 10^-6, meaning one part in a million. A micrometer, written μm, thus equals 10^-6 meters. That's why this unit is defined as one millionth of a meter. For comparison, a nanometer is 10^-9 m, a millimeter is 10^-3 m, and a centimeter is 10^-2 m. In biology, many cells and bacteria fall into the micrometer range, illustrating the practical scale of this unit.

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