# Metre

The metre is the SI unit of length and is equal to 1650763.73 wavelengths in vacuum of the radiation corresponding to the transition 2p_{10}-5d_{s} of a krypton 86 atom.

1 kilometre | = | 1000 metres | 1 m | = | 100cm | |

1 yard | = | 0.9144 metres | 1 m | = | 1.094 yards | |

1 metre | = | 39.37 inches |

Classical radius of an electron | 2.818x10^{-15} m |

Diameter of carbon atom | 3.0x10^{-10} m |

Diameter of amoeba | 1.0x10^{-4} m |

Height of man | 2 m |

Height of large tree | 30 m |

Height of Mt. Everest | 8.848x10^{3} m |

Radius of the Sun | 6.96x10^{8} m |

Mean Sun Earth distance | 1.496x10^{11} m |

Distance to Crab Nebula (N.G.C. 1952) | 6.0x10^{19} m |

**See also: **decametre, decimetre, Femtometre, kilometre, Length, Micrometre, Mile.

**Subjects: ** Units