The international system of units (SI) is based on the seven units given here.

**Table B 1**

Length | metre | m |

Mass | kilogram | kg |

Thermodynamic temperature | kelvin | K |

Time | second | s |

Luminous intensity | candela | cd |

Amount of a substance | mole | mol |

Electrical current | ampere | A |

The following are the defined units with standard symbols.

**Table B 2**

Force | newton, N | 1N=1 kg m/s^{2} |

Power | watt, W | 1W=1 J/s |

Pressure | pascal, Pa | 1 Pa=1 N/m^{2} |

Temperature | kelvin, K | K = °C + 273.15 |

Work, heat, energy | joule, J | 1 J=1N m |

Potential difference | volt, V | 1V=1 W/A |

Electrical resistance | ohm, ς |
1 ς = 1 V/A |

Derived units are obtained from the governing equations ...

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