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
Famous quotes containing the words derived, units, special and/or names:
“In the case of our main stock of well-worn predicates, I submit that the judgment of projectibility has derived from the habitual projection, rather than the habitual projection from the judgment of projectibility. The reason why only the right predicates happen so luckily to have become well entrenched is just that the well entrenched predicates have thereby become the right ones.”
—Nelson Goodman (b. 1906)
“Even in harmonious families there is this double life: the group life, which is the one we can observe in our neighbour’s household, and, underneath, another—secret and passionate and intense—which is the real life that stamps the faces and gives character to the voices of our friends. Always in his mind each member of these social units is escaping, running away, trying to break the net which circumstances and his own affections have woven about him.”
—Willa Cather (1873–1947)
“Passengers in 1937 totaled 270,000; so many of these were celebrities that two Newark newspapers ran special airport columns.”
—For the State of New Jersey, U.S. public relief program (1935-1943)
“All the names of good and evil are parables: they do not declare, but only hint. Whoever among you seeks knowledge of them is a fool!”
—Friedrich Nietzsche (1844–1900)