Physical Quantity | Name of Unit | Abbreviation |
---|---|---|

Mass | Kilogram | kg |

Length | Meter | m |

Time | Second | ks or sec |

Temperature | Kelvin | K |

Amount of substance | Mole | mol |

Electric current | Ampere | A or amp |

Luminous intensity | Candela | cd |

Prefix | Abreviation | Meaning | Example |
---|---|---|---|

Peta | P | 10^{15} | 1 petabyte (PW) = 1 × 10^{15} bytes |

Tera | T | 10^{12} | 1 terawatt (TW) = 1 × 10^{12} watts |

Giga | G | 10^{9} | 1 gigajoule (GJ) = 1 × 10^{9} joules |

Mega | M | 10^{6} | 1 megabyte (MB) = 1 × 10^{6} bytes |

Kilo | k | 10^{3} | 1 kilogram (kg) = 1 × 10^{3} grams |

Deci | d | 10^{− 1} | 1 decimeter(dm) = 1 × 10^{− 1} meter |

Centi | c | 10^{− 2} | 1 centimeter(cm) = 1 × 10^{− 2} meter |

Melli | m | 10^{− 3} | 1 milliwatt (mW) = 1 × 10^{− 3} watt |

Micro | μ | 10^{− 6} | 1 microjoule(μJ) = 1 × 10^{− 6} joule |

Nano | n | 10^{− 9} | 1 nanosecond(ns) = 1 × 10^{− 9} second |

Pico | p | 10^{− 12} | 1 picowatt(pW) = 1 × 10^{− 12} watt |

Femto | f | 10^{− 15} | 1 femtosecond(fs) = 1 × 10^{− 15} second |

Atto | a | 10^{− 18} | 1 attowatt(aW) = 1 × 10^{− 18} watt |

Zepto | d | 10^{− 21} | 1 zeptojoule(zJ) = 1 × 10^{− 21} joule |

- Celsius scale: based on the properties of water.
- Kelvin scale: the “absolute” temperature, which is the SI unit of temperature.
- The Kelvin unit has the same size as the Celsius unit, but the two scales have different zero points.
- 0 K is the lowest possible temperature ("absolute zero").
- This the point at which all thermal energy would have been drained from an object; so the temperature cannot get any lower.
- 0 K = − 273.15 °C, so K = °C + 273.15

Date of last modification: Summer , 2019