Predefined Units#
The default registry (u) comes pre-populated with SI base units, derived units, and
common non-SI units.
Base SI Units#
Symbol |
Name |
Dimension |
Aliases |
Prefixable? |
|---|---|---|---|---|
|
meter |
Length (L) |
Yes |
|
|
kilogram |
Mass (M) |
No |
|
|
second |
Time (T) |
Yes |
|
|
ampere |
Current (I) |
Yes |
|
|
kelvin |
Temperature (Θ) |
Yes |
|
|
mole |
Amount (N) |
Yes |
|
|
candela |
Luminous (J) |
Yes |
Named Derived SI Units#
Symbol |
Name |
Dimension |
Aliases |
Prefixable? |
|---|---|---|---|---|
|
gram |
Mass |
Yes |
|
|
hertz |
Frequency (1/T) |
Yes |
|
|
newton |
Force (M·L/T²) |
Yes |
|
|
pascal |
Pressure (M/L·T²) |
Yes |
|
|
joule |
Energy (M·L²/T²) |
Yes |
|
|
watt |
Power (M·L²/T³) |
Yes |
|
|
coulomb |
Charge (I·T) |
Yes |
|
|
volt |
Voltage (M·L²/T³·I) |
Yes |
|
|
farad |
Capacitance (I²·T⁴/M·L²) |
Yes |
|
|
ohm |
Resistance (M·L²/T³·I²) |
|
Yes |
|
siemens |
Conductance (I²·T³/M·L²) |
Yes |
|
|
weber |
Magnetic Flux (M·L²/T²·I) |
Yes |
|
|
tesla |
Flux Density (M/T²·I) |
Yes |
|
|
henry |
Inductance (M·L²/T²·I²) |
Yes |
|
|
lumen |
Luminous Flux (J) |
Yes |
|
|
lux |
Illuminance (J/L²) |
Yes |
|
|
becquerel |
Radioactivity (1/T) |
Yes |
|
|
gray |
Absorbed Dose (L²/T²) |
Yes |
|
|
sievert |
Equivalent Dose (L²/T²) |
Yes |
|
|
katal |
Catalytic Activity (N/T) |
Yes |
Dimensionless Units#
Symbol |
Name |
Dimension |
Aliases |
Prefixable? |
|---|---|---|---|---|
|
radian |
Dimensionless |
Yes |
|
|
steradian |
Dimensionless |
Yes |
Non-SI Time Units#
Symbol |
Name |
Dimension |
Aliases |
Prefixable? |
|---|---|---|---|---|
|
minute |
Time |
|
No |
|
hour |
Time |
|
No |
|
day |
Time |
|
No |
|
week |
Time |
|
No |
|
fortnight |
Time |
|
No |
|
month |
Time (Gregorian avg) |
|
No |
|
year |
Time (Gregorian avg) |
|
No |
|
Julian year |
Time |
No |
|
|
decade |
Time |
|
No |
|
century |
Time |
|
No |
|
millennium |
Time |
|
No |