## SI fundamental units

## SI fundamental units

In 1960, an international committee established a set of standards for the fundamental quantities of science. It is called the SI (Système International) fundamental units. The three fundamental physical quantities of mechanics are**length**,

**mass**, and

**time**, which in the SI system have the units meter (m), kilogram (kg), and second (s), respectively. These fundamental quantities cannot be defined in terms of more basic quantities.

Meaning | SI Units | Basic SI Units |

Length | `m` | `m` |

Mass | `kg` | `kg` |

Time | `s` | `s` |

Speed | `m//s` | `m//s` |

Force | `N` | `kg•m//s^2` |