Calc86 v2 (c) 2021 Dylan Sharhon Powered by math.js (Apache 2.0) Jos de Jong et al. More Perfect DOS VGA font by Zeh Fernando and LÆMEUR CONSTANTS m_e mass of electron m_p mass of proton m_n mass of neutron q_e elementary charge ε_0 vacuum permittivity µ_0 vacuum permeability k_B Boltzmann constant N_A Avogadro constant f_Cs caesium standard ¢ speed of light G gravitational constant ħ reduced Planck constant e Euler's number i imaginary unit