SI prefixes – Units in power of 10.

**International System of units**, is the modern form of unit metric system and is most common system for measurement in world. While studying engineering or any subject in which we perform calculation in power of 10 then, we come across the terms like**“micro”, “gega”, “milli”**and symbol like**“µ, n”**etc.**SI prefixes – Units in power of 10**

You might know about this, but let us learn more terms like **yotta, exa, petta etc**. This terms are known as SI prefixes or metric prefixes. Each prefix has a unique symbol that is prepended to the unit symbol.According to International system of units specifies 20 different SI prefixes or Metric prefixes :Here is the table for 20 different prefixes with their symbol and value.

### SI prefixes – Units in power of 10

Prefixes | Symbol | Value |
---|---|---|

yotta | Y | 10^{24} |

zetta | Z | 10^{21} |

exa | E | 10^{18} |

petta | P | 10^{15} |

tera | T | 10^{12} |

giga | G | 10^{9} |

mega | M | 10^{6} |

killo | k | 10^{3} |

hecto | h | 10^{2} |

deca | da | 10^{1} |

- | 1 – one | 10^{0} |

deci | d | 10^{-1} |

centi | c | 10^{-2} |

milli | m | 10^{-3} |

micro | µ | 10^{-6} |

nano | n | 10^{-9} |

pico | p | 10^{-12} |

femto | f | 10^{-15} |

atto | a | 10^{-18} |

zepto | z | 10^{-21} |

yocto | y | 10^{-24} |