Table 5-1 was drawn from the recommendations of CODATA (the Committee on Data for Science and Technology). The full 1998 CODATA set of constants may be found at http://physics.nist.gov/cuu/Constants/index.html. A PDF version of this table is also available.
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Table 5-1. Physical constants. |
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Uncert. |
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speed of light |
c (see note *) |
2.997 924 58´108 m s–1 (1010 cm s–1) |
exact |
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Planck constant |
h |
6.626 068 76(52)´10–34 J s (10–27 erg s) |
78 |
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Planck constant, reduced |
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1.054 571 596(82)´10–34 J s = 6.582 118 89(26)´10–22 MeV s |
78, 39 |
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electron charge magnitude |
e |
4.803 204 20(19)´10–10 esu = 1.602 176 462(63)´10–19 C |
39, 59 |
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conversion constant |
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197.326 960 1(78) MeV fm (= eV nm) |
39 |
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electron mass |
me |
0.510 998 902(21) MeV/c2 = 9.109 381 88(72)´10–31 kg |
40, 79 |
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proton mass |
mp |
938.271 998(38) MeV/c2 = 1.672 621 58(13)´10–27 kg |
40, 79 |
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= 1.007 276 466 88(13) u = 1836.152 667 5(39) me |
0.13, 2.1 |
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deuteron mass |
md |
1875.612 762 (75) MeV/c2 |
40 |
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unified atomic mass unit (u) |
(mass 12C atom)/12 = (1 g)/(NA mol) |
931.494 013(37) MeV/c2 = 1.660 538 73(13)´10–27 kg |
40, 79 |
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permittivity of free space |
e0 = 1/(m0c2) |
8.854 187 817¼´10–12 F m–1 |
exact |
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permeability of free space |
m0 |
4p´10–7 N A–2 = 12.566 370 614¼´10–7 N A–2 |
exact |
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fine-structure constant |
a = e2/4pe0 |
1/137.035 999 76(50) |
3.7 |
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classical electron radius |
re = e2/4pe0mec2 |
2.817 940 285(31)´10–15 m |
11 |
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Bohr radius (mnucleus = ¥) |
a0 = 4pe0 |
0.529 177 208 3(19)´10–10 m (10–8 cm) |
3.7 |
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Rydberg energy |
hcR¥
= mee4/2(4pe0)2 =mec2a2/2 |
13.605 691 72(53) eV |
39 |
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Thomson cross section |
sT
= 8p |
0.665 245 854(15) barn (10–28 m2) |
22 |
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Bohr magneton |
mB = e |
5.788 381 749(43)´10–11 MeV T–1 |
7.3 |
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nuclear magneton |
mN = e |
3.152 451 238(24)´10–14 MeV T–1 |
7.6 |
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electron cyclotron freq./field |
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1.758 820 174(71)´1011 rad s–1 T–1 |
40 |
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proton cyclotron freq./field |
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9.578 834 08(38)´107 rad s–1 T–1 |
40 |
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Table 5-1. Physical constants(continued). |
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Uncert. |
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Avogadro constant |
NA |
6.022 141 99(47)´1023 mol–1 |
79 |
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Boltzman constant |
k |
1.380 650 3(24)´10–23 J K–1 = 8.617 342(15)´10–5 eV K–1 |
1700 |
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molar volume, ideal gas at STP |
NAk (273.15 K)/(101 325 Pa) |
22.413 996(39)´10–3 m3 mol–1 |
1700 |
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p = 3.141 592 653 589 793 238 |
e = 2.718 281 828 459 045 235 |
g = 0.577 215 664 901 532 861 |
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The meter is the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second. |
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1 in. = 2.54 cm |
1 newton = 105 dyne |
1 eV/c2 = 1.782 662´10–33 g |
1 coulomb = 2.997 924 58´109 esu |
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1 Å = 10–8 cm |
1 joule = 107 erg |
hc/(1 eV) = 1.239 842 mm |
1 tesla = 104 gauss |
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1 fm = 10–13 cm |
1 cal = 4.184 joule |
1 eV/h = 2.417 989´1014 Hz |
1 atm = 1.013 25´106 dyne/cm2 |
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1 barn = 10–24 cm2 |
1 eV = 1.602 176 5´10–12 erg |
1 eV/k = 11 604.5 K |
0°C = 273.15 K |
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