Derived Units With Special Names
In addition to the two dimensionless derived units radian (rad) and steradian (sr), 20 other derived units have special names.
| Name | Symbol | Quantity | Expression in terms of other units | Expression in terms of SI base units |
|---|---|---|---|---|
| hertz | Hz | frequency | 1/s | s−1 |
| radian | rad | angle | m/m | dimensionless |
| steradian | sr | solid angle | m2/m2 | dimensionless |
| newton | N | force, weight | kg⋅m/s2 | kg⋅m⋅s−2 |
| pascal | Pa | pressure, stress | N/m2 | kg⋅m−1⋅s−2 |
| joule | J | energy, work, heat | N⋅m = C⋅V = W⋅s | kg⋅m2⋅s−2 |
| watt | W | power, radiant flux | J/s = V⋅A | kg⋅m2⋅s−3 |
| coulomb | C | electric charge or quantity of electricity | s⋅A | s⋅A |
| volt | V | voltage, electrical potential difference, electromotive force | W/A = J/C | kg⋅m2⋅s−3⋅A−1 |
| farad | F | electric capacitance | C/V | kg−1⋅m−2⋅s4⋅A2 |
| ohm | Ω | electric resistance, impedance, reactance | V/A | kg⋅m2⋅s−3⋅A−2 |
| siemens | S | electrical conductance | 1/Ω = A/V | kg−1⋅m−2⋅s3⋅A2 |
| weber | Wb | magnetic flux | J/A | kg⋅m2⋅s−2⋅A−1 |
| tesla | T | magnetic field strength, magnetic flux density | V⋅s/m2 = Wb/m2 = N/(A⋅m) | kg⋅s−2⋅A−1 |
| henry | H | inductance | V⋅s/A = Wb/A | kg⋅m2⋅s−2⋅A−2 |
| degree Celsius | °C | temperature relative to 273.15 K | K | K |
| lumen | lm | luminous flux | cd⋅sr | cd |
| lux | lx | illuminance | lm/m2 | m−2⋅cd |
| becquerel | Bq | radioactivity (decays per unit time) | 1/s | s−1 |
| gray | Gy | absorbed dose (of ionizing radiation) | J/kg | m2⋅s−2 |
| sievert | Sv | equivalent dose (of ionizing radiation) | J/kg | m2⋅s−2 |
| katal | kat | catalytic activity | mol/s | s−1⋅mol |
Read more about this topic: SI Derived Unit
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