The International System of Units (abbreviated SI from “systeme internationale “, the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. There are seven base units in the system, from which other units are derived, as follows:

Property |
Unit |

Length | metre (m) |

Mass | kilogram (kg) |

Time | Second (s) |

Electrical current | ampere (A) |

Thermodynamic temperature | kelvin (K) |

Amount of substance | mole |

Luminous intensity | Candela |

The derived units most ikmportantfor hydro production as are follows:

Property |
Unit |

Force, F | Newton (N) |

Work | Joule (J) |

Power, P | Watt (W) |

Energy, E | kiloWatt-hour (kW-h) |

Velocity, v | m/s |

Area, A | m² |

Flow, Q | m³/s |