In this article, let us see key definitions, equations and formulas related to Units and Dimensions. These will also help you in preparing for competitive exams like JEE and NEET.

Index

## Unit

Any physical quantity is measured in terms of an internationally recognized basic standard known as a unit.

### Fundamental Units

Physical Quantity | SI Unit | Symbol |

Length | Metre | m |

Mass | Kilogram | Kg |

Time | Second | S |

Electric Current | Ampere | A |

Temperature | Kelvin | K |

Luminous Intensity | Candela | Cd |

Amount of Substance | Mole | mol |

### Supplementary Units

Physical Quantity | SI Unit | Symbol |

Plane Angle | radian | r |

Solid Angle | Steradian | Sr |

### Metric Prefixes

Prefix | Symbol | Value |

Centi | c | \(10^-2\) |

Mili | m | \(10^-3\) |

Micro | μ | \(10^-6\) |

Nano | n | \(10^-9\) |

Pico | p | \(10^-12\) |

Kilo | K | \(10^3\) |

Mega | M | \(10^6\) |