# Extra materials - Units

home/teaching/physics71031/extra/units

- basic units and prefixes
- exponent rules
- volume and surface area
- 1 horse-sized duck or 100 duck-sized horses?

## basic units and prefixes

Units for three SI base quantities

Quantity | Unit Name | Unit Symbol |
---|---|---|

Length [L] | meter | m |

Time [T] | second | s |

Mass [M] | kilogram | kg |

Some prefixes for SI Units that you **must** remember!

Factor | Prefix | Symbol |
---|---|---|

$10^9$ | giga- | G |

$10^6$ | mega- | M |

$10^3$ | kilo- | k |

$10^{-2}$ | centi- | c |

$10^{-3}$ | milli- | m |

$10^{-6}$ | micro- | $\mu$ |

$10^{-9}$ | nano- | n |