pub const EV_TO_JOULE: f64 = E_CHARGE;
pub const JOULE_TO_EV: f64 = 1.0 / EV_TO_JOULE;
pub const HC_EV_NM: f64 = H * C / EV_TO_JOULE * 1e9;
pub const KEV_TO_KELVIN: f64 = 1e3 / KELVIN_TO_KEV;
pub const KELVIN_TO_KEV: f64 = K_B / E_CHARGE;
pub const CALORIE_TO_JOULE: f64 = 4.184;
pub const ATM_TO_PASCAL: f64 = 101_325.0;
pub const BAR_TO_PASCAL: f64 = 1.0e5;
pub const DEGREE_TO_RAD: f64 = PI / 180.0;
pub const RAD_TO_DEGREE: f64 = 180.0 / PI;
pub const BARN: f64 = 1.0e-28;
pub const ANGSTROM: f64 = 1.0e-10;
pub const FERMI: f64 = 1.0e-15;
pub const KWH_TO_J: f64 = 3.6e6;
pub const MEV_TO_J: f64 = EV_TO_JOULE * 1e6;