# Decametre

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.

Decametre | |
---|---|

Unit system | SI |

Unit of | length |

Symbol | dam |

Conversions | |

1 dam in ... | ... is equal to ... |

SI base units | 10 m |

imperial/US units | 10.936 yd 393.70 in |

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