Physical Constants & Units Conversion 2006
A. Miyoshi
A. Miyoshi
Here, a brief summary of physical constants based on P.J. Mohr, B.N. Taylor, and D.B. Newell (2007), "The 2006 CODATA Recommended Values of the Fundamental Physical Constants" (Web Version 5.0). This database was developed by J. Baker, M. Douma, and S. Kotochigova. Available: http://physics.nist.gov/constants [2008, May 13]. National Institute of Standards and Technology, Gaithersburg, MD 20899. is shown. For detail, see, Fundamental Physical Constants from NIST.
| π | 3.14159265358979323846 |
| Value | Unit | Rel. std. uncert. |
Quantity | |
| c0 | 299 792 458 = 2.997 924 58×108 |
m s−1 | (exact) | speed of light in vacuum |
| h | 6.626 068 96(33)×10−34 | J s | 5.0×10−8 | Planck constant |
| e | 1.602 176 487(40)×10−19 | C | 2.5×10−8 | elementary charge |
| NA | 6.022 141 79(30)×1023 | mol−1 | 5.0×10−8 | Avogadro constant |
| me | 9.109 382 15(45)×10−31 | kg | 5.0×10−8 | electron mass |
| R | 8.314 472(15) | J K−1 mol−1 | 1.7×10−6 | molar gas constant |
| G | 6.674 28(67)×10−11 | m3 kg−1 s−2 | 1.0×10−4 | Newtonian constant of gravitation |
| Derived as | Value | Unit | Rel. std. uncert. |
Quantity | |
| R∞ | mec0α2 / 2h | 10 973 731.568 527(73) = 1.097 373 156 8527(73)×107 |
m−1 | 6.6×10−12 | Rydberg constant |
| α | μ0c0e2 / 2h | 7.297 352 5376(50)×10−3 | – | 6.8×10−10 | fine structure constant |
| F | NAe | 96 485.3399(24) = 9.648 533 99(24)×104 |
C mol−1 | 2.5×10−8 | Faraday constant |
| μB | eh / 4πme | 927.400 915(23)×10−26 | J T−1 | 2.5×10−8 | Bohr magneton |
| Derived as | Value | Unit | Rel. std. uncert. |
Quantity | |
| μ0 | 4π×10−7 | ~ 12.566 370 614×10−7 | H m−1 (N A−2) | (exact) | magnetic constant |
| ε0 | 1 / μ0c02 | ~ 8.854 187 818×10−12 | F m−1 | (exact) | electric constant |
| ħ | h / 2π | 1.054 571 628(53)×10−34 | J s | 5.0×10−8 | |
| mu | 10−3 / NA | 1.660 538 782(83)×10−27 | kg | 5.0×10−8 | atomic mass constant |
| k | R / NA | 1.380 6504(24)×10−23 | J K−1 | 1.7×10−6 | Boltzmann constant |
| a0 | α / 4πR∞ | 0.529 177 208 59(36)×10−10 | m | 6.8×10−10 | Bohr radius |
| Eh | 2R∞hc0 | 4.359 743 94(22)×10−18 | J | 5.0×10−8 | Hartree energy |
| Derived Quatity | Symbol | Expression in terms of other SI units |
Expression in terms of SI base units |
| electric charge | C | A s | |
| electric potential | V | J C−1 | m2 kg s−3 A−1 |
| electric capacitance | F | C V−1 | m−2 kg−1 s4 A2 |
| Celsius temperature | °C | θ / °C + 273.15 ≡ T / K |
| Quantity | |
| pressure | 1 bar ≡ 105 Pa |
| 1 atm ≡ 101 325 Pa | |
| 1 Torr ≡ 1 / 760 atm ~ 133.322 3684 Pa | |
| energy | 1 cal ≡ 4.184 J |
| cross section | 1 b (barn) ≡ 1 × 10−28 m2 |