scipp.constants#

Physical and mathematical constants with units. This module a wrapper around scipy.constants and requires the scipy package to be installed.

Mathematical constants:

 pi Pi golden Golden ratio golden_ratio Golden ratio

Physical constants:

 c speed of light in vacuum speed_of_light speed of light in vacuum mu_0 the magnetic constant $$\mu_0$$ epsilon_0 the electric constant (vacuum permittivity), $$\epsilon_0$$ h the Planck constant $$h$$ Planck the Planck constant $$h$$ hbar $$\hbar = h/(2\pi)$$ G Newtonian constant of gravitation gravitational_constant Newtonian constant of gravitation g standard acceleration of gravity e elementary charge elementary_charge elementary charge R molar gas constant gas_constant molar gas constant alpha fine-structure constant fine_structure fine-structure constant N_A Avogadro constant Avogadro Avogadro constant k Boltzmann constant Boltzmann Boltzmann constant sigma Stefan-Boltzmann constant $$\sigma$$ Stefan_Boltzmann Stefan-Boltzmann constant $$\sigma$$ Wien Wien displacement law constant Rydberg Rydberg constant m_e electron mass electron_mass electron mass m_p proton mass proton_mass proton mass m_n neutron mass neutron_mass neutron mass

In addition to the above variables, scipp.constants also contains the 2018 CODATA recommended values [CODATA2018] database containing more physical constants. The database is accessed using scipp.constants.physical_constants().

CODATA2018

CODATA Recommended Values of the Fundamental Physical Constants 2018. https://physics.nist.gov/cuu/Constants/

Functions

 physical_constants(key[, with_variance]) Returns the CODATA recommended value with unit of the requested physical constant.