A centimeter is a unit of length measurement, equal to one hundredth of a meter. The unit of length, abbreviated as cm. ， 1cm = 1/ 100m。 1cm (cm) = 10mm (mm) =0. 1dm (decimeter) =0.0 1m (meter).

The international system of units chooses seven independent quantities as the base quantity, and the first one is length. Its basic unit name is meter, the symbol is m, and centimeter is not an international unit.

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Length is a unit of measurement in one-dimensional space and one of the seven basic units of measurement in the international system of units.

In geometry, length usually refers to the longest dimension. Usually, when measuring the side length of a straight line in two-dimensional space, the one with a larger length value is called length, which is not greater than its value or wider than the "side", and the expression is usually length times width. So width is actually a measure of length, so measuring the height of "vertical length" in three-dimensional space is length.

As one of the most important measurements in daily life, there are many units to measure the length. As an international standard unit, the length of "1 m" needs a scientific and rigorous definition.