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# Constants

CalQlata does not rely on the accuracy of constants provided in any source without verifying it through research and calculation.
As such, you may find that some of the constants provided below do not match those provided by recognised authorities such as Codata; e.g. Newton's gravitational constant.
Where we disagree with other values, we always provide our theoretical reasoning.

The following tables contain the principal constants used by CalQlata in its calculations.

## Exact

The following table contains constants that are or have been calculated using exact, undisputable values.

 Name Symbol Value Units natural logarithm e 2.71828182845905 Avogadro's Constant NA 6.02214129E+23 permeability of free space μ₀ 1.25663706143592E-06 H/m permittivity of free space ε₀ 8.85418775855161E-12 F/m elementary charge unit e 1.60217648753E-19 C electron/proton charge Q 1.60217648753E-19 C Faraday's Constant F 96485.3317942158 C/mol Coulomb's constant k 8.98755184732667E+09 N.m²/C² Dirac’s constant ħ 1.05457207144921E-34 J.s Planck’s constant h 6.62607174469163E-34 J.s

## Probably Exact

The following table contains constants that are or have been calculated using values that are probably exact and not usually disputed.

 Name Symbol Value Units golden ratio Φ 1.61803398874989 atomic mass unit amu ‎1.66053892103219E-24 kg speed of light in a vacuum c 299792459 m/s rest mass of an electron mₑ 9.1093897E-31 kg mass of a proton mp 1.67262163783E-27 kg mass of a neutron mn 1.6475621480E-27 kg Bohr radius aₒ 5.2917721067E-11 m Rydberg constant R∞ 10973726.9561359 /m electron energy @ aₒ Rᵧ 2.17987197684936E-18 J electron energy @ aₒ Rᵧ 13.605691968492 eV Boltzmann's constant KB 1.38065156E-23 J/K/molecule ideal gas constant Rᵢ 8.314478766579 J/K/mol