Tp Planck temperature 32.2 1.417000e+32 K n0 Loschmidt constant 25.4 2.687000e+25 1/m^3 NA avogadro's number 23.8 6.022000e+23 1/mol KJ Josephson constant 14.7 4.836000e+14 Hz/V GF/hbarc3 Fermi coupling constant 14.7 4.544000e+14 1/J^2 ke Coulomb's constant 10.0 8.988000e+09 N·m^2/C^2 c speed of light 8.5 2.997925e+08 m/s^2 Rinf Rydberg constant 7.0 1.097373e+07 1/m atm standard atmosphere 5.0 1.013250e+05 Pa F Faraday constant 5.0 9.648533e+04 C/mol RK von Klitzing constant 4.4 2.581281e+04 ohm Z0 char imped vacuum 2.6 3.767300e+02 ohm gn standard acceleration of gravity 1.0 9.806650e+00 m/s^2 R gas constant 0.9 8.314000e+00 J/(K·mol) thetaW weak mixing angle -0.3 5.026710e-01 Vm molar volume of ideal gas -1.6 2.242000e-02 m^3/mol c2 second radiation constant -1.8 1.439000e-02 m·K alpha fine-structure constant -2.1 7.297000e-03 b Wien disp law constant -2.5 2.898000e-03 m·K G0 conductance quantum -4.1 7.748000e-05 S mu0 magnetic constant -5.9 1.257000e-06 V·s/(A·m) sigma Stefan-Boltzman constant -7.2 5.670000e-08 W/(m^2·K^4) mP Planck mass -7.7 2.176000e-08 kg A0star Angstrom star -10.0 1.000000e-10 m G constant of gravitation -10.2 6.674000e-11 m^3/(kg·s^2) a0 Bohr radius -10.3 5.292000e-11 m e0 electric constant -11.1 8.854000e-12 F/m lambda_C compton wavelength -11.6 2.426000e-12 re classical electron radius -14.6 2.818000e-15 m phi0 magnetic flux quantum -14.7 2.068000e-15 Wb c1 first radiation constant -15.4 3.742000e-16 W·m^2 Eh Hartree energy -17.4 4.360000e-18 J H0 Hubble constant -17.7 2.195000e-18 1/s e elementary charge -18.8 1.602000e-19 C k Boltzmann constant -22.9 1.381000e-23 J/K muB Bohr magneton -23.0 9.274000e-24 J/T muN nuclear magneton -26.3 5.051000e-27 J/T mn neutron mass -26.8 1.675000e-27 kg mp proton mass -26.8 1.673000e-27 kg m_u atomic mass constant -26.8 1.661000e-27 kg sigmaT Thomson cross section -28.2 6.652000e-29 m^2 me electron mass -30.0 9.109000e-31 kg h Planck constant -33.2 6.626000e-34 J·s hbar reduced Planck constant -34.0 1.055000e-34 J·s lP Planck length -34.8 1.616000e-35 m tP Planck time -43.3 5.391000e-44 s Lambda cosmological constant -51.9 1.190000e-52 1/m^2