SI Base Units and Associated Constants (AC)
All capitalized entries in the Unit and AC (associated constants) columns from the table below can be imported:
| Unit |
Symbol |
Quantity |
AC |
AC Name |
AC value |
| SECOND |
\(\text{s}\) |
time |
DVCS |
Hyperfine transition frequency of Cs |
\(\Delta\nu_\text{Cs}=9192631770~\text{Hz}\) |
| METER |
\(\text{m}\) |
length |
CLIGHT |
Speed of light |
\(c=299792458~\frac{\text{m}}{\text{s}}\) |
| KILOGRAM |
\(\text{kg}\) |
mass |
PLANCK |
Planck constant |
\(h=6.62607015\times 10^{-34}~\text{J}\cdot\text{s}\) |
| AMPERE |
\(\text{A}\) |
electric current |
QE |
Elementary charge |
\(e=1.602176634\times 10^{-19}~\text{C}\) |
| KELVIN |
\(\text{K}\) |
thermodynamic temperature |
KB |
Boltzmann constant |
\(k_\text{B}=1.380649\times 10^{-23}~\frac{\text{J}}{\text{K}}\) |
| MOL |
\(\text{mol}\) |
amount of substance |
NAV |
Avogadro constant |
\(N_\text{A}=6.02214076\times 10^{23}~\text{mol}^{-1}\) |
| CANDELA |
\(\text{cd}\) |
luminous intensity |
KCD |
Luminous efficacy of \(540~\text{THz}\) radiation |
\(K_\text{cd}=683~\frac{\text{lm}}{\text{W}}\) |
Example
| from si_units import SECOND, DVCS
print(SECOND)
print(DVCS)
|