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Micrometre


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A micrometre (the American spelling is micrometer; symbol is µm) is a unit of length in the SI measurement system. It can also be called a micron. It is one millionth of a metre.

A micrometre is often used as a measurement for cells like bacteria, because bacteria are very small too.

A micron is very small.he:תחיליות במערכת היחידות הבינלאומית#מיקרו