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# Decimetre

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### Decimetre

The decimetre (British English or decimeter (American English); SI symbol dm) is a unit of length in the metric system, equal to one tenth of a metre, the SI base unit of length. It is equal to ten centimetres and 10 decimetres equal a metre. One decimetre is equivalent to 3.93700787 inches.

It can be written in scientific notation as 100×10−3 m (engineering notation) or 1 E-1 m (exponential notation) — meaning 100 × 1 mm or 0.1 m respectively. The c is pronounced as /s/, unlike in decametre. The common non-SI metric unit of volume, the litre, is defined as one cubic decimetre (however, from 1901 to 1964, there was a slight difference between the two due to the litre being defined with respect to the kilogram rather than the metre).

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