Physical Quantity | Quantity symbol | SI Unit | Unit Symbol |
Expression in SI base units | Alternative expressions |
---|---|---|---|---|---|
frequency | v, f | hertz | Hz | s-1 | - |
force | F | newton | N | kg m s-2 | J m-1 |
pressure | p | pascal | Pa | kg m-1 s-2 | N m-2 |
energy (all forms) | E, U, V, W,etc. | joule | J | kg m2 s-2 | N m = C V = V A s |
power | P | watt | W | kg m2 s-3 | J s-1 = VA |
electric charge | Q | coulomb | C | A s | - |
electric potential difference | E, φ, ζ, Φ, η, etc. | volt | V | kg m2 s-3 A-1 | J A-1 s-1 = J C-1 |
electrical capacitance | C | farad | F | A2 s4 kg-1 m-2 | C V-1 |
electrical resistance | R | ohm | Ω | kg m2 s-3 A-2 | V A-1 |
electrical conductance | G | siemens | S | A2 s3 kg-1 m-2 | A V-1 = Ω-1 |
magnetic flux | Φ | weber | Wb | kg m2 s-2 A-1 | V s = T m2 |
magnetic induction | B | tesla | T | kg s-2 A-1 | Wb m-2 = N A-1 m-1 |
inductance | L, M | henry | H | kg m2 s-2 A-2 | V A-1 s = Wb A-1 |
luminous flux | Φ | lumen | lm | cd sr | - |
illumination | E | lux | lx | cd sr m-2 | lm m-2 |
activity (of a radionuclide) | A | becquerel | Bq | s-1 | - |
absorbed dose | D | gray | Gy | m2 s-2 | J kg-1 |
dose equivalent | H | sievert | Sv | m2 s-2 | J kg-1 |
catalytic activity | z | katal | kat | mol s-1 | - |
Celsius temperature | t | degree Celsius | °C | K | - |
plane angle | α , β , γ , θ , Φ | radian | rad | m m-1 | dimensionless |
solid angle | ω , Ω | steradian | sr | m2 m-2 | dimensionless |
The special names and symbols of the 22 SI derived units with special names and symbols given in table 3 above may themselves be included in the names and symbols of other SI derived units, as shown in table 5.
Note on degree Celsius.
The derived unit in Table 3 with the special name degree Celsius and
special symbol °C needs comment. The way temperature
scales used to be defined, it remains common practice to express a thermodynamic
temperature, symbol T, in terms of its difference from the reference
temperature T0 = 273.15 K. This temperature
difference is called a Celsius temperature, symbol t, and is
defined by the quantity equation
The unit of Celsius temperature is the degree Celsius, symbol °C. The
numerical value of a Celsius temperature t expressed in degrees
Celsius is given by
It follows from the definition of t that the numerical
value of a given temperature difference or temperature interval will be the same for both degree Celsius and the kelvin.
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