The SI units of measurement are based on seven quantities, other commonly used quantities are derived from these.

SI Base units:

Base Quantity | Base Unit | Base Symbol |
---|---|---|

Length | Meter | m |

Time | Second | s |

Mass | Kilogram | kg |

Temperature | Kelvin | K |

Electric current | Ampere | A |

Luminous intensity | Candela | cd |

Amount of substance | Mole | Mol |

SI derived units:

Derived quantity | Derived unit | Derived symbol |
---|---|---|

Area | square meter | [m^{2}] |

Volume | cubic meter | [m^{3}] |

acceleration | meter per second squared | [m/s^{2}] |

Speed, velocity | meter per second | [m/s] |

wave number | reciprocal meter | [m^{-1}] |

mass density | kilogram per cubic meter | [kg/m^{3}] |

specific volume | cubic meter per kilogram | v [kg/m^{3}] |

current density | ampere per square meter | [A/m^{2}] |

magnetic field strength | ampere per meter | [A/m] |

amount of substance concentration | mol per cubic meter | [mol/m^{3}] |

luminance | caldela per square meter | [cd/m^{2}] |

mass fraction | kilogram per kilogram | [kg/kg] |

Frequency | Hertz | f [Hz] |

Force | Newton | N |

Energy, Work | Joule | J |

Electric charge | Coulomb | C |

Power | Watt | W [J/s] |

Potential difference | volt | V or U |

Capacitance | Farad | F |

Electrical resistance | Ohm | Ω |

Magnetic flux | Weber | Wb [V.s] |

Magnetic flux density | Tesla | T [Wb/m^{2}] |

Inductance | Henry | H |

Pressure | Pascal | Pa [N/m^{2}] |

Radionuclide activity | Becquerel | Bq |

Dynamic viscosity | Pascal second | µ [Pa·s] |

Moment of force | Newton meter | [N·m] |

Surface tension | Newton per meter | [N/m] |

Angular velocity | Radian per second | [rad/s] |

Angular acceleration | Radian per second squared | [rad/s^{2}] |

Heat flux density, irradiance | Watt per square meter | [W/m^{2}] |

Entropy | Joule per kelvin | S [J/K] |

Specific heat capacity, specific entropy | Joule per kilogram kelvin | cp [J/(kg·K)] |

Specific energy | Joule per kilogram | J/kg |

Thermal conductivity | Watt per meter kelvin | K [W/(m·K)] |

Energy density | Joule per cubic meter | [J/m^{3}] |

Electric field strength | Volt per meter | [V/m] |

Electric charge density | Coulomb per cubic meter | [C/m^{3}] |

Electric flux density | Coulomb per square meter | [C/m^{2}] |

Molar energy | Joule per mole | [J/mol] |

Molar entropy | Joule per mole Kelvin | [J/(mol·K)] |

Absorbed dose rate | Gray per second | [Gy/s] |

Radiant intensity | Watt per steradian | [W/sr] |

Radiance | Watt per square meter Steradian | [W/(m^{2}·sr)] |

catalytic concentration | katal per cubic meter | [kat/m^{3}] |

SI Unit prefixes

Name | Multiplier | Prefix | Power of 10 |
---|---|---|---|

Tera | 1,000,000,000,000 | T | 1 x 10^{12} |

Giga | 1,000,000,000 | G | 1 x 10^{9} |

Mega | 1,000,000 | M | 1 x 10^{6} |

Kilo | 1,000 | k | 1 x 10^{3} |

Unit | 1 | ||

Milli | 0.001 | m | 1 x 10^{-3} |

Micro | 0.000,001 | µ | 1 x 10^{-6} |

Value-1 | Value-2 | η | 1 x 10^{-9} |

Value-1 | Value-2 | ρ | 1 x 10^{-12} |

SI Base units: Table as image for offline viewing

SI Unit prefixes: Table as image for offline viewing

SI derived units:Table as image for offline viewing