rizer.misc.units#
Classes#
Physical constants and unit conversions. |
Module Contents#
- class rizer.misc.units.Units#
Physical constants and unit conversions.
All units are by default in the International System of Units (SI).
- m_e = 9.1093837015e-31#
Electron mass [kg].
- e = 1.602176634e-19#
Elementary charge [C].
- k_b = 1.380649e-23#
Boltzmann constant [J/K].
- N_a = 6.02214076e+23#
Avogadro’s number [mol^-1].
- M_e = 5.485799088728283e-07#
Electron molar mass [kg/mol].
- eV_to_K = 11604.518121550082#
Conversion factor from eV to K.
- K_to_eV = 8.617333262145179e-05#
Conversion factor from K to eV.
- eV_to_J = 1.602176634e-19#
Conversion factor from eV to J.
- J_to_eV = 6.241509074460763e+18#
Conversion factor from J to eV.
- K_to_J = 1.380649e-23#
Conversion factor from K to J.
- J_to_K = 7.24297051603992e+22#
Conversion factor from J to K.
- kJ_per_mol_to_J_per_particle = 1.6605390671738467e-21#
Conversion factor from kJ/mol to J/particle.
- Da = 1.6605390666e-27#
Dalton or atomic mass constant [kg].
- m_N2 = 4.651734508829244e-26#
N2 mass [kg].
- R = 8.31446261815324#
Ideal gas constant [J/(mol K)].
- R_kmol = 8314.46261815324#
Ideal gas constant [J/(kmol K)].
- P_1_bar = 100000.0#
1 bar [Pa].
- h = 6.62607015e-34#
Planck constant [J s].
- hbar#
Reduced Planck constant [J s].
- c = 299792458#
Speed of light [m/s].
- epsilon_0 = 8.85418782e-12#
Vacuum permittivity [F/m].
- stefan_boltzmann#
Stefan-Boltzmann constant [W/(m^2 K^4)].
- spitzer_constant#
Spitzer conductivity constant in Ohm^(-1) . m^(-1) . K^(-3/2).
The conductivity of a fully-ionized plasma is given by the Spitzer conductivity:
\[\sigma = \text{Spitzer constant} \times \frac{T_e^{3/2}}{\log(\lambda)}\]with :
\(T_e\) the electron temperature in K,
\(\log(\lambda)\) the Coulomb logarithm.
The constant is given by:
\[\begin{align} \text{Spitzer constant} &= \left(\frac{4 \pi \varepsilon_0}{e}\right)^2 \times \left(\frac{k_b^{3/2}}{\frac{4}{3} \sqrt{2 \pi m_e} }\right) \times 1.96 &= 1.53 \times 10^{-2} \, \Omega^{-1} \, \text{m}^{-1} \, \text{K}^{-3/2} \end{align}\]with:
\(\varepsilon_0\) the vacuum permittivity,
\(e\) the elementary charge,
\(k_b\) the Boltzmann constant,
\(m_e\) the electron mass.
- element_radius: dict[str, float]#
Element radius [m].
Data taken from https://en.wikipedia.org/wiki/Atomic_radius#Empirically_measured_atomic_radius.