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:
“All moral discipline, all moral perfection derived from the soul of literature.”
—Thomas Mann (18751955)
“Even in harmonious families there is this double life: the group life, which is the one we can observe in our neighbours household, and, underneath, anothersecret and passionate and intensewhich 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 (18731947)
“The books may say that nine-month-olds crawl, say their first words, and are afraid of strangers. Your exuberantly concrete and special nine-month-old hasnt read them. She may be walking already, not saying a word and smiling gleefully at every stranger she sees. . . . You can support her best by helping her learn what shes trying to learn, not what the books say a typical child ought to be learning.”
—Amy Laura Dombro (20th century)
“Almanacked, their names live; they
Have slipped their names, and stand at ease,
Or gallop for what must be joy,”
—Philip Larkin (19221985)