pub const C: f64 = 299_792_458.0;
pub const G: f64 = 6.674_30e-11;
pub const H: f64 = 6.626_070_15e-34;
pub const HBAR: f64 = H / (2.0 * std::f64::consts::PI);
pub const K_B: f64 = 1.380_649e-23;
pub const N_A: f64 = 6.022_140_76e23;
pub const E_CHARGE: f64 = 1.602_176_634e-19;
pub const EPSILON_0: f64 = 8.854_187_812_8e-12;
pub const MU_0: f64 = 1.0 / (EPSILON_0 * C * C);
pub const K_COULOMB: f64 = 1.0 / (4.0 * std::f64::consts::PI * EPSILON_0);
pub const SIGMA_SB: f64 = 5.670_374_419e-8;
pub const R_GAS: f64 = K_B * N_A;
pub const FARADAY: f64 = N_A * E_CHARGE;
pub const ALPHA_FINE: f64 = 7.297_352_569_3e-3;
pub const PLANCK_LENGTH: f64 = 1.616_255e-35;
pub const PLANCK_MASS: f64 = 2.176_434e-8;
pub const PLANCK_TIME: f64 = 5.391_247e-44;
pub const PLANCK_TEMP: f64 = 1.416_784e32;
pub const G_F: f64 = 1.166_378_7e-5;
pub const ALPHA_S: f64 = 0.1181;