Planck's Constant h, 6.626x10-34 m2-kg/s
Boltzmann's Constant k, 1.38x10-23 m2-kg-s-2K-1
Electron Mass me, 0.511 MeV, 9.11x10-31 kg
Electron Charge qe, 1.6x10-19 C
Proton Mass, 938 MeV, 1.673x10-27 kg
Neutron Mass, 939 MeV, 1.675x10-27 kg
Speed of Sound in Tissue, 1540 m/s
Speed of Light c, 3x108 m/s
Molar Gas Constant R, 8.31 J mole-1 K-1
Avogadro's Number Na, 6.02x1023 atoms/mole
Energy Mass Conversion, 931.48 MeV/amu
Electron Volt, 1.6x10-19 J/eV
Gyromagnetic Ratio of H, 26.8x107 radians T-1 s-1
Gyromagnetic Ratio of P, 10.8x107 radians T-1 s-1
Gyromagnetic Ratio of Na, 7.08x107 radians T-1 s-1
Ionization Constant Wair/e, 33.97 eV/ion-pair-in-air
Roentgen R, 2.58x10-4 C/kg