# Decametre

# Decametre

Unit of length

A **decametre** (International spelling as used by the International Bureau of Weights and Measures and by most English speaking countries,^{[1]}^{[2]} United States spelling **dekameter** or **decameter**^{[3]}^{[4]}), symbol **dam** ("da" for the SI prefix *deca-*,^{[1]} "m" for the SI unit metre), is a unit of length in the International System of Units (SI) equal to ten metres.

*in Wiktionary, the free dictionary.*

**decametre**While any combination of SI prefix and unit can be used, many are rarely used in practice; the decametre is used less frequently than other units of length. One practical use is for altitude of geopotential heights in meteorology. The volumetric form *cubic decametre* is convenient for describing large volumes of water such as in rivers and lakes;^{[citation needed]} a volume of one cubic decametre (dam^{3}) is equivalent to a capacity of one megalitre (ML).

One technical atmosphere is the pressure of one decametre of water. Also, the are (a), a metric unit for land area, is equal to one square decametre (dam^{2}).