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 | [m2] |
| Volume | cubic meter | [m3] |
| acceleration | meter per second squared | [m/s2] |
| Speed, velocity | meter per second | [m/s] |
| wave number | reciprocal meter | [m-1] |
| mass density | kilogram per cubic meter | [kg/m3] |
| specific volume | cubic meter per kilogram | v [kg/m3] |
| current density | ampere per square meter | [A/m2] |
| magnetic field strength | ampere per meter | [A/m] |
| amount of substance concentration | mol per cubic meter | [mol/m3] |
| luminance | caldela per square meter | [cd/m2] |
| 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/m2] |
| Inductance | Henry | H |
| Pressure | Pascal | Pa [N/m2] |
| 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/s2] |
| Heat flux density, irradiance | Watt per square meter | [W/m2] |
| 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/m3] |
| Electric field strength | Volt per meter | [V/m] |
| Electric charge density | Coulomb per cubic meter | [C/m3] |
| Electric flux density | Coulomb per square meter | [C/m2] |
| 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/(m2·sr)] |
| catalytic concentration | katal per cubic meter | [kat/m3] |
SI Unit prefixes
| Name | Multiplier | Prefix | Power of 10 |
|---|---|---|---|
| Tera | 1,000,000,000,000 | T | 1 x 1012 |
| Giga | 1,000,000,000 | G | 1 x 109 |
| Mega | 1,000,000 | M | 1 x 106 |
| Kilo | 1,000 | k | 1 x 103 |
| 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
