Physical Constants & Units Conversion 2014
A. Miyoshi
A. Miyoshi
Here, a brief summary of physical constants based on P.J. Mohr, B.N. Taylor, and D.B. Newell (2015), "The 2014 CODATA Recommended Values of the Fundamental Physical Constants" (Web Version 7.0). This database was developed by J. Baker, M. Douma, and S. Kotochigova. Available: http://physics.nist.gov/constants [Wednesday, 07-Oct-2015 01:28:43 EDT]. 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 | 6.626 070 040(81)×10−34 | J s | 1.2×10−8 | Planck constant |
| e | 1.602 176 6208(98)×10−19 | C | 6.1×10−9 | elementary charge |
| NA | 6.022 140 857(74)×1023 | mol−1 | 1.2×10−8 | Avogadro constant |
| me | 9.109 383 56(11)×10−31 | kg | 1.2×10−8 | electron mass |
| R | 8.314 4598(48) | J K−1 mol−1 | 5.7×10−7 | molar gas constant |
| G | 6.674 08(31)×10−11 | m3 kg−1 s−2 | 4.7×10−5 | Newtonian constant of gravitation |
| Derived as | Value | Unit | Rel. std. uncert. |
Quantity | |
| R∞ | mec0α2 / 2h | 10 973 731.568 508(65) = 1.097 373 156 8508(65)×107 |
m−1 | 5.9×10−12 | Rydberg constant |
| α | μ0c0e2 / 2h | 7.297 352 5664(17)×10−3 | – | 2.3×10−10 | fine structure constant |
| F | NAe | 96 485.332 89(59) = 9.648 533 289(59)×104 |
C mol−1 | 6.2×10−9 | Faraday constant |
| μB | eh / 4πme | 927.400 9994(57)×10−26 | J T−1 | 6.2×10−9 | 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 | 1.054 571 800(13)×10−34 | J s | 1.2×10−8 | |
| mu | 10−3 / NA | 1.660 539 040(20)×10−27 | kg | 1.2×10−8 | atomic mass constant |
| k | R / NA | 1.380 648 52(13)×10−23 | J K−1 | 5.7×10−7 | Boltzmann constant |
| a0 | α / 4πR∞ | 0.529 177 210 67(12)×10−10 | m | 2.3×10−10 | Bohr radius |
| Eh | 2R∞hc0 | 4.359 744 650(54)×10−18 | J | 1.2×10−8 | 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 |