AstroLAB's Interesting Tables      
Physical Constants      
Name Symbol Number Exp CGS Units Relative Error
(ppm)
speed of light in a vacuum c 2.99792458 10  cm s-1 exact
Planck constant h 6.6260755(40) -27  erg s 0.6
  hbar 1.05457266(63) -27  erg s 0.6
Gravitational constant G 6.67259(85) -8  cm3 g-1 s-2 128
Electron charge e 4.8032068(14) -10  esu 0.3
Mass of electron me 9.1093897(54) -28  g 0.59
Mass of proton mp 1.6726231(10) -24  g 0.59
Mass of neutron mn 1.6749286(10) -24  g 0.59
Mass of hydrogen mH 1.6733 -24  g --
Atomic mass unit amu 1.6605402(10) -24  g 0.59
Avagadro's number NA 6.0221367(36) 23   0.59
Boltzmann constant k 1.380658(12) -16  erg k-1 8.5
Electron volt eV 1.6021772(50) -12  erg ~0.60
Radiation density constant a 7.5646 -15  erg cm-3 K-4 --
Stefan-Boltzmann constant \sigma 5.67051(19) -5  erg cm-2 K-4 s-1 34
Fine structure constant \alpha 7.29735308(33) -3   0.045
Rydberg constant R\inf 2.1798741(13) -11  erg 0.6