**S**ystème

**I**nternational d'Unités) system of units has many derived units from the seven base units. A derived unit would be a unit that is a combination of base units. Density would be an example where density = mass/volume or kg/m

^{3}.

Many derived units have special names for the properties or measurements they represent. This table lists eighteen of these specialized units along with their basic unit factors. Many of them honor famous scientists for their work in the fields which use these units.

Note the units of radian and steradian do not actually represent any physical property to measure but are understood to be an arc length per radius (radian) or arc length x arc length per radius x radius (steradian). These units are generally considered unitless.

Measurement | Derived Unit | Name of Unit | Combination of Base Units |

plane angle | rad | radian | m·m^{-1} = 1 |

solid angle | sr | steradian | m^{2}m^{-2} = 1 |

frequency | Hz | hertz | s^{-1} |

force | N | newton | m·kg/s^{2} |

pressure | Pa | pascal | N/m^{2} or kg/ms^{2} |

energy | J | joule | N·m or m^{2}kg/s^{2} |

power | W | watt | J/s or m^{2}kg/s^{3} |

electric charge | C | coulomb | A·s |

electromotive force | V | volt | W/A or m^{2}kg/As^{3} |

capacitance | F | farad | C/V or A^{2}s^{3}/kg·m^{2} |

electric resistance | Ω | ohm | V/A or kg·m^{2}/A^{2}s^{4} |

electric conductance | S | siemens | A/V or A^{2}s^{4}/kg·m^{2} |

magnetic flux | Wb | weber | V·s or kg·m^{2}/A·s^{2} |

magnetic flux density | T | tesla | Wb/m^{2} or kg/A^{2}s^{2} |

inductance | H | henry | Wb/A or kg·m^{2}/A^{2}s^{2} |

luminous flux | lm | lumen | cd·sr or cd |

illuminance | lx | lux | lm/m^{2} or cd/m^{2} |

catalytic activity | kat | katal | mol/s |