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2 Fundamental Physical Constants --- Complete Listing
5 From: http://physics.nist.gov/constants
9 Quantity Value Uncertainty Unit
10 ------------------------------------------------------------------------------------------------------------------------
11 {220} lattice spacing of silicon 192.015 5762 e-12 0.000 0050 e-12 m
12 alpha particle-electron mass ratio 7294.299 5365 0.000 0031
13 alpha particle mass 6.644 656 20 e-27 0.000 000 33 e-27 kg
14 alpha particle mass energy equivalent 5.971 919 17 e-10 0.000 000 30 e-10 J
15 alpha particle mass energy equivalent in MeV 3727.379 109 0.000 093 MeV
16 alpha particle mass in u 4.001 506 179 127 0.000 000 000 062 u
17 alpha particle molar mass 4.001 506 179 127 e-3 0.000 000 000 062 e-3 kg mol^-1
18 alpha particle-proton mass ratio 3.972 599 689 51 0.000 000 000 41
19 Angstrom star 1.000 014 98 e-10 0.000 000 90 e-10 m
20 atomic mass constant 1.660 538 782 e-27 0.000 000 083 e-27 kg
21 atomic mass constant energy equivalent 1.492 417 830 e-10 0.000 000 074 e-10 J
22 atomic mass constant energy equivalent in MeV 931.494 028 0.000 023 MeV
23 atomic mass unit-electron volt relationship 931.494 028 e6 0.000 023 e6 eV
24 atomic mass unit-hartree relationship 3.423 177 7149 e7 0.000 000 0049 e7 E_h
25 atomic mass unit-hertz relationship 2.252 342 7369 e23 0.000 000 0032 e23 Hz
26 atomic mass unit-inverse meter relationship 7.513 006 671 e14 0.000 000 011 e14 m^-1
27 atomic mass unit-joule relationship 1.492 417 830 e-10 0.000 000 074 e-10 J
28 atomic mass unit-kelvin relationship 1.080 9527 e13 0.000 0019 e13 K
29 atomic mass unit-kilogram relationship 1.660 538 782 e-27 0.000 000 083 e-27 kg
30 atomic unit of 1st hyperpolarizablity 3.206 361 533 e-53 0.000 000 081 e-53 C^3 m^3 J^-2
31 atomic unit of 2nd hyperpolarizablity 6.235 380 95 e-65 0.000 000 31 e-65 C^4 m^4 J^-3
32 atomic unit of action 1.054 571 628 e-34 0.000 000 053 e-34 J s
33 atomic unit of charge 1.602 176 487 e-19 0.000 000 040 e-19 C
34 atomic unit of charge density 1.081 202 300 e12 0.000 000 027 e12 C m^-3
35 atomic unit of current 6.623 617 63 e-3 0.000 000 17 e-3 A
36 atomic unit of electric dipole mom. 8.478 352 81 e-30 0.000 000 21 e-30 C m
37 atomic unit of electric field 5.142 206 32 e11 0.000 000 13 e11 V m^-1
38 atomic unit of electric field gradient 9.717 361 66 e21 0.000 000 24 e21 V m^-2
39 atomic unit of electric polarizablity 1.648 777 2536 e-41 0.000 000 0034 e-41 C^2 m^2 J^-1
40 atomic unit of electric potential 27.211 383 86 0.000 000 68 V
41 atomic unit of electric quadrupole mom. 4.486 551 07 e-40 0.000 000 11 e-40 C m^2
42 atomic unit of energy 4.359 743 94 e-18 0.000 000 22 e-18 J
43 atomic unit of force 8.238 722 06 e-8 0.000 000 41 e-8 N
44 atomic unit of length 0.529 177 208 59 e-10 0.000 000 000 36 e-10 m
45 atomic unit of mag. dipole mom. 1.854 801 830 e-23 0.000 000 046 e-23 J T^-1
46 atomic unit of mag. flux density 2.350 517 382 e5 0.000 000 059 e5 T
47 atomic unit of magnetizability 7.891 036 433 e-29 0.000 000 027 e-29 J T^-2
48 atomic unit of mass 9.109 382 15 e-31 0.000 000 45 e-31 kg
49 atomic unit of momentum 1.992 851 565 e-24 0.000 000 099 e-24 kg m s^-1
50 atomic unit of permittivity 1.112 650 056... e-10 (exact) F m^-1
51 atomic unit of time 2.418 884 326 505 e-17 0.000 000 000 016 e-17 s
52 atomic unit of velocity 2.187 691 2541 e6 0.000 000 0015 e6 m s^-1
53 Avogadro constant 6.022 141 79 e23 0.000 000 30 e23 mol^-1
54 Bohr magneton 927.400 915 e-26 0.000 023 e-26 J T^-1
55 Bohr magneton in eV/T 5.788 381 7555 e-5 0.000 000 0079 e-5 eV T^-1
56 Bohr magneton in Hz/T 13.996 246 04 e9 0.000 000 35 e9 Hz T^-1
57 Bohr magneton in inverse meters per tesla 46.686 4515 0.000 0012 m^-1 T^-1
58 Bohr magneton in K/T 0.671 7131 0.000 0012 K T^-1
59 Bohr radius 0.529 177 208 59 e-10 0.000 000 000 36 e-10 m
60 Boltzmann constant 1.380 6504 e-23 0.000 0024 e-23 J K^-1
61 Boltzmann constant in eV/K 8.617 343 e-5 0.000 015 e-5 eV K^-1
62 Boltzmann constant in Hz/K 2.083 6644 e10 0.000 0036 e10 Hz K^-1
63 Boltzmann constant in inverse meters per kelvin 69.503 56 0.000 12 m^-1 K^-1
64 characteristic impedance of vacuum 376.730 313 461... (exact) ohm
65 classical electron radius 2.817 940 2894 e-15 0.000 000 0058 e-15 m
66 Compton wavelength 2.426 310 2175 e-12 0.000 000 0033 e-12 m
67 Compton wavelength over 2 pi 386.159 264 59 e-15 0.000 000 53 e-15 m
68 conductance quantum 7.748 091 7004 e-5 0.000 000 0053 e-5 S
69 conventional value of Josephson constant 483 597.9 e9 (exact) Hz V^-1
70 conventional value of von Klitzing constant 25 812.807 (exact) ohm
71 Cu x unit 1.002 076 99 e-13 0.000 000 28 e-13 m
72 deuteron-electron mag. mom. ratio -4.664 345 537 e-4 0.000 000 039 e-4
73 deuteron-electron mass ratio 3670.482 9654 0.000 0016
74 deuteron g factor 0.857 438 2308 0.000 000 0072
75 deuteron mag. mom. 0.433 073 465 e-26 0.000 000 011 e-26 J T^-1
76 deuteron mag. mom. to Bohr magneton ratio 0.466 975 4556 e-3 0.000 000 0039 e-3
77 deuteron mag. mom. to nuclear magneton ratio 0.857 438 2308 0.000 000 0072
78 deuteron mass 3.343 583 20 e-27 0.000 000 17 e-27 kg
79 deuteron mass energy equivalent 3.005 062 72 e-10 0.000 000 15 e-10 J
80 deuteron mass energy equivalent in MeV 1875.612 793 0.000 047 MeV
81 deuteron mass in u 2.013 553 212 724 0.000 000 000 078 u
82 deuteron molar mass 2.013 553 212 724 e-3 0.000 000 000 078 e-3 kg mol^-1
83 deuteron-neutron mag. mom. ratio -0.448 206 52 0.000 000 11
84 deuteron-proton mag. mom. ratio 0.307 012 2070 0.000 000 0024
85 deuteron-proton mass ratio 1.999 007 501 08 0.000 000 000 22
86 deuteron rms charge radius 2.1402 e-15 0.0028 e-15 m
87 electric constant 8.854 187 817... e-12 (exact) F m^-1
88 electron charge to mass quotient -1.758 820 150 e11 0.000 000 044 e11 C kg^-1
89 electron-deuteron mag. mom. ratio -2143.923 498 0.000 018
90 electron-deuteron mass ratio 2.724 437 1093 e-4 0.000 000 0012 e-4
91 electron g factor -2.002 319 304 3622 0.000 000 000 0015
92 electron gyromag. ratio 1.760 859 770 e11 0.000 000 044 e11 s^-1 T^-1
93 electron gyromag. ratio over 2 pi 28 024.953 64 0.000 70 MHz T^-1
94 electron mag. mom. -928.476 377 e-26 0.000 023 e-26 J T^-1
95 electron mag. mom. anomaly 1.159 652 181 11 e-3 0.000 000 000 74 e-3
96 electron mag. mom. to Bohr magneton ratio -1.001 159 652 181 11 0.000 000 000 000 74
97 electron mag. mom. to nuclear magneton ratio -1838.281 970 92 0.000 000 80
98 electron mass 9.109 382 15 e-31 0.000 000 45 e-31 kg
99 electron mass energy equivalent 8.187 104 38 e-14 0.000 000 41 e-14 J
100 electron mass energy equivalent in MeV 0.510 998 910 0.000 000 013 MeV
101 electron mass in u 5.485 799 0943 e-4 0.000 000 0023 e-4 u
102 electron molar mass 5.485 799 0943 e-7 0.000 000 0023 e-7 kg mol^-1
103 electron-muon mag. mom. ratio 206.766 9877 0.000 0052
104 electron-muon mass ratio 4.836 331 71 e-3 0.000 000 12 e-3
105 electron-neutron mag. mom. ratio 960.920 50 0.000 23
106 electron-neutron mass ratio 5.438 673 4459 e-4 0.000 000 0033 e-4
107 electron-proton mag. mom. ratio -658.210 6848 0.000 0054
108 electron-proton mass ratio 5.446 170 2177 e-4 0.000 000 0024 e-4
109 electron-tau mass ratio 2.875 64 e-4 0.000 47 e-4
110 electron to alpha particle mass ratio 1.370 933 555 70 e-4 0.000 000 000 58 e-4
111 electron to shielded helion mag. mom. ratio 864.058 257 0.000 010
112 electron to shielded proton mag. mom. ratio -658.227 5971 0.000 0072
113 electron volt 1.602 176 487 e-19 0.000 000 040 e-19 J
114 electron volt-atomic mass unit relationship 1.073 544 188 e-9 0.000 000 027 e-9 u
115 electron volt-hartree relationship 3.674 932 540 e-2 0.000 000 092 e-2 E_h
116 electron volt-hertz relationship 2.417 989 454 e14 0.000 000 060 e14 Hz
117 electron volt-inverse meter relationship 8.065 544 65 e5 0.000 000 20 e5 m^-1
118 electron volt-joule relationship 1.602 176 487 e-19 0.000 000 040 e-19 J
119 electron volt-kelvin relationship 1.160 4505 e4 0.000 0020 e4 K
120 electron volt-kilogram relationship 1.782 661 758 e-36 0.000 000 044 e-36 kg
121 elementary charge 1.602 176 487 e-19 0.000 000 040 e-19 C
122 elementary charge over h 2.417 989 454 e14 0.000 000 060 e14 A J^-1
123 Faraday constant 96 485.3399 0.0024 C mol^-1
124 Faraday constant for conventional electric current 96 485.3401 0.0048 C_90 mol^-1
125 Fermi coupling constant 1.166 37 e-5 0.000 01 e-5 GeV^-2
126 fine-structure constant 7.297 352 5376 e-3 0.000 000 0050 e-3
127 first radiation constant 3.741 771 18 e-16 0.000 000 19 e-16 W m^2
128 first radiation constant for spectral radiance 1.191 042 759 e-16 0.000 000 059 e-16 W m^2 sr^-1
129 hartree-atomic mass unit relationship 2.921 262 2986 e-8 0.000 000 0042 e-8 u
130 hartree-electron volt relationship 27.211 383 86 0.000 000 68 eV
131 Hartree energy 4.359 743 94 e-18 0.000 000 22 e-18 J
132 Hartree energy in eV 27.211 383 86 0.000 000 68 eV
133 hartree-hertz relationship 6.579 683 920 722 e15 0.000 000 000 044 e15 Hz
134 hartree-inverse meter relationship 2.194 746 313 705 e7 0.000 000 000 015 e7 m^-1
135 hartree-joule relationship 4.359 743 94 e-18 0.000 000 22 e-18 J
136 hartree-kelvin relationship 3.157 7465 e5 0.000 0055 e5 K
137 hartree-kilogram relationship 4.850 869 34 e-35 0.000 000 24 e-35 kg
138 helion-electron mass ratio 5495.885 2765 0.000 0052
139 helion mass 5.006 411 92 e-27 0.000 000 25 e-27 kg
140 helion mass energy equivalent 4.499 538 64 e-10 0.000 000 22 e-10 J
141 helion mass energy equivalent in MeV 2808.391 383 0.000 070 MeV
142 helion mass in u 3.014 932 2473 0.000 000 0026 u
143 helion molar mass 3.014 932 2473 e-3 0.000 000 0026 e-3 kg mol^-1
144 helion-proton mass ratio 2.993 152 6713 0.000 000 0026
145 hertz-atomic mass unit relationship 4.439 821 6294 e-24 0.000 000 0064 e-24 u
146 hertz-electron volt relationship 4.135 667 33 e-15 0.000 000 10 e-15 eV
147 hertz-hartree relationship 1.519 829 846 006 e-16 0.000 000 000 010 e-16 E_h
148 hertz-inverse meter relationship 3.335 640 951... e-9 (exact) m^-1
149 hertz-joule relationship 6.626 068 96 e-34 0.000 000 33 e-34 J
150 hertz-kelvin relationship 4.799 2374 e-11 0.000 0084 e-11 K
151 hertz-kilogram relationship 7.372 496 00 e-51 0.000 000 37 e-51 kg
152 inverse fine-structure constant 137.035 999 679 0.000 000 094
153 inverse meter-atomic mass unit relationship 1.331 025 0394 e-15 0.000 000 0019 e-15 u
154 inverse meter-electron volt relationship 1.239 841 875 e-6 0.000 000 031 e-6 eV
155 inverse meter-hartree relationship 4.556 335 252 760 e-8 0.000 000 000 030 e-8 E_h
156 inverse meter-hertz relationship 299 792 458 (exact) Hz
157 inverse meter-joule relationship 1.986 445 501 e-25 0.000 000 099 e-25 J
158 inverse meter-kelvin relationship 1.438 7752 e-2 0.000 0025 e-2 K
159 inverse meter-kilogram relationship 2.210 218 70 e-42 0.000 000 11 e-42 kg
160 inverse of conductance quantum 12 906.403 7787 0.000 0088 ohm
161 Josephson constant 483 597.891 e9 0.012 e9 Hz V^-1
162 joule-atomic mass unit relationship 6.700 536 41 e9 0.000 000 33 e9 u
163 joule-electron volt relationship 6.241 509 65 e18 0.000 000 16 e18 eV
164 joule-hartree relationship 2.293 712 69 e17 0.000 000 11 e17 E_h
165 joule-hertz relationship 1.509 190 450 e33 0.000 000 075 e33 Hz
166 joule-inverse meter relationship 5.034 117 47 e24 0.000 000 25 e24 m^-1
167 joule-kelvin relationship 7.242 963 e22 0.000 013 e22 K
168 joule-kilogram relationship 1.112 650 056... e-17 (exact) kg
169 kelvin-atomic mass unit relationship 9.251 098 e-14 0.000 016 e-14 u
170 kelvin-electron volt relationship 8.617 343 e-5 0.000 015 e-5 eV
171 kelvin-hartree relationship 3.166 8153 e-6 0.000 0055 e-6 E_h
172 kelvin-hertz relationship 2.083 6644 e10 0.000 0036 e10 Hz
173 kelvin-inverse meter relationship 69.503 56 0.000 12 m^-1
174 kelvin-joule relationship 1.380 6504 e-23 0.000 0024 e-23 J
175 kelvin-kilogram relationship 1.536 1807 e-40 0.000 0027 e-40 kg
176 kilogram-atomic mass unit relationship 6.022 141 79 e26 0.000 000 30 e26 u
177 kilogram-electron volt relationship 5.609 589 12 e35 0.000 000 14 e35 eV
178 kilogram-hartree relationship 2.061 486 16 e34 0.000 000 10 e34 E_h
179 kilogram-hertz relationship 1.356 392 733 e50 0.000 000 068 e50 Hz
180 kilogram-inverse meter relationship 4.524 439 15 e41 0.000 000 23 e41 m^-1
181 kilogram-joule relationship 8.987 551 787... e16 (exact) J
182 kilogram-kelvin relationship 6.509 651 e39 0.000 011 e39 K
183 lattice parameter of silicon 543.102 064 e-12 0.000 014 e-12 m
184 Loschmidt constant (273.15 K, 101.325 kPa) 2.686 7774 e25 0.000 0047 e25 m^-3
185 mag. constant 12.566 370 614... e-7 (exact) N A^-2
186 mag. flux quantum 2.067 833 667 e-15 0.000 000 052 e-15 Wb
187 molar gas constant 8.314 472 0.000 015 J mol^-1 K^-1
188 molar mass constant 1 e-3 (exact) kg mol^-1
189 molar mass of carbon-12 12 e-3 (exact) kg mol^-1
190 molar Planck constant 3.990 312 6821 e-10 0.000 000 0057 e-10 J s mol^-1
191 molar Planck constant times c 0.119 626 564 72 0.000 000 000 17 J m mol^-1
192 molar volume of ideal gas (273.15 K, 100 kPa) 22.710 981 e-3 0.000 040 e-3 m^3 mol^-1
193 molar volume of ideal gas (273.15 K, 101.325 kPa) 22.413 996 e-3 0.000 039 e-3 m^3 mol^-1
194 molar volume of silicon 12.058 8349 e-6 0.000 0011 e-6 m^3 mol^-1
195 Mo x unit 1.002 099 55 e-13 0.000 000 53 e-13 m
196 muon Compton wavelength 11.734 441 04 e-15 0.000 000 30 e-15 m
197 muon Compton wavelength over 2 pi 1.867 594 295 e-15 0.000 000 047 e-15 m
198 muon-electron mass ratio 206.768 2823 0.000 0052
199 muon g factor -2.002 331 8414 0.000 000 0012
200 muon mag. mom. -4.490 447 86 e-26 0.000 000 16 e-26 J T^-1
201 muon mag. mom. anomaly 1.165 920 69 e-3 0.000 000 60 e-3
202 muon mag. mom. to Bohr magneton ratio -4.841 970 49 e-3 0.000 000 12 e-3
203 muon mag. mom. to nuclear magneton ratio -8.890 597 05 0.000 000 23
204 muon mass 1.883 531 30 e-28 0.000 000 11 e-28 kg
205 muon mass energy equivalent 1.692 833 510 e-11 0.000 000 095 e-11 J
206 muon mass energy equivalent in MeV 105.658 3668 0.000 0038 MeV
207 muon mass in u 0.113 428 9256 0.000 000 0029 u
208 muon molar mass 0.113 428 9256 e-3 0.000 000 0029 e-3 kg mol^-1
209 muon-neutron mass ratio 0.112 454 5167 0.000 000 0029
210 muon-proton mag. mom. ratio -3.183 345 137 0.000 000 085
211 muon-proton mass ratio 0.112 609 5261 0.000 000 0029
212 muon-tau mass ratio 5.945 92 e-2 0.000 97 e-2
213 natural unit of action 1.054 571 628 e-34 0.000 000 053 e-34 J s
214 natural unit of action in eV s 6.582 118 99 e-16 0.000 000 16 e-16 eV s
215 natural unit of energy 8.187 104 38 e-14 0.000 000 41 e-14 J
216 natural unit of energy in MeV 0.510 998 910 0.000 000 013 MeV
217 natural unit of length 386.159 264 59 e-15 0.000 000 53 e-15 m
218 natural unit of mass 9.109 382 15 e-31 0.000 000 45 e-31 kg
219 natural unit of momentum 2.730 924 06 e-22 0.000 000 14 e-22 kg m s^-1
220 natural unit of momentum in MeV/c 0.510 998 910 0.000 000 013 MeV/c
221 natural unit of time 1.288 088 6570 e-21 0.000 000 0018 e-21 s
222 natural unit of velocity 299 792 458 (exact) m s^-1
223 neutron Compton wavelength 1.319 590 8951 e-15 0.000 000 0020 e-15 m
224 neutron Compton wavelength over 2 pi 0.210 019 413 82 e-15 0.000 000 000 31 e-15 m
225 neutron-electron mag. mom. ratio 1.040 668 82 e-3 0.000 000 25 e-3
226 neutron-electron mass ratio 1838.683 6605 0.000 0011
227 neutron g factor -3.826 085 45 0.000 000 90
228 neutron gyromag. ratio 1.832 471 85 e8 0.000 000 43 e8 s^-1 T^-1
229 neutron gyromag. ratio over 2 pi 29.164 6954 0.000 0069 MHz T^-1
230 neutron mag. mom. -0.966 236 41 e-26 0.000 000 23 e-26 J T^-1
231 neutron mag. mom. to Bohr magneton ratio -1.041 875 63 e-3 0.000 000 25 e-3
232 neutron mag. mom. to nuclear magneton ratio -1.913 042 73 0.000 000 45
233 neutron mass 1.674 927 211 e-27 0.000 000 084 e-27 kg
234 neutron mass energy equivalent 1.505 349 505 e-10 0.000 000 075 e-10 J
235 neutron mass energy equivalent in MeV 939.565 346 0.000 023 MeV
236 neutron mass in u 1.008 664 915 97 0.000 000 000 43 u
237 neutron molar mass 1.008 664 915 97 e-3 0.000 000 000 43 e-3 kg mol^-1
238 neutron-muon mass ratio 8.892 484 09 0.000 000 23
239 neutron-proton mag. mom. ratio -0.684 979 34 0.000 000 16
240 neutron-proton mass ratio 1.001 378 419 18 0.000 000 000 46
241 neutron-tau mass ratio 0.528 740 0.000 086
242 neutron to shielded proton mag. mom. ratio -0.684 996 94 0.000 000 16
243 Newtonian constant of gravitation 6.674 28 e-11 0.000 67 e-11 m^3 kg^-1 s^-2
244 Newtonian constant of gravitation over h-bar c 6.708 81 e-39 0.000 67 e-39 (GeV/c^2)^-2
245 nuclear magneton 5.050 783 24 e-27 0.000 000 13 e-27 J T^-1
246 nuclear magneton in eV/T 3.152 451 2326 e-8 0.000 000 0045 e-8 eV T^-1
247 nuclear magneton in inverse meters per tesla 2.542 623 616 e-2 0.000 000 064 e-2 m^-1 T^-1
248 nuclear magneton in K/T 3.658 2637 e-4 0.000 0064 e-4 K T^-1
249 nuclear magneton in MHz/T 7.622 593 84 0.000 000 19 MHz T^-1
250 Planck constant 6.626 068 96 e-34 0.000 000 33 e-34 J s
251 Planck constant in eV s 4.135 667 33 e-15 0.000 000 10 e-15 eV s
252 Planck constant over 2 pi 1.054 571 628 e-34 0.000 000 053 e-34 J s
253 Planck constant over 2 pi in eV s 6.582 118 99 e-16 0.000 000 16 e-16 eV s
254 Planck constant over 2 pi times c in MeV fm 197.326 9631 0.000 0049 MeV fm
255 Planck length 1.616 252 e-35 0.000 081 e-35 m
256 Planck mass 2.176 44 e-8 0.000 11 e-8 kg
257 Planck mass energy equivalent in GeV 1.220 892 e19 0.000 061 e19 GeV
258 Planck temperature 1.416 785 e32 0.000 071 e32 K
259 Planck time 5.391 24 e-44 0.000 27 e-44 s
260 proton charge to mass quotient 9.578 833 92 e7 0.000 000 24 e7 C kg^-1
261 proton Compton wavelength 1.321 409 8446 e-15 0.000 000 0019 e-15 m
262 proton Compton wavelength over 2 pi 0.210 308 908 61 e-15 0.000 000 000 30 e-15 m
263 proton-electron mass ratio 1836.152 672 47 0.000 000 80
264 proton g factor 5.585 694 713 0.000 000 046
265 proton gyromag. ratio 2.675 222 099 e8 0.000 000 070 e8 s^-1 T^-1
266 proton gyromag. ratio over 2 pi 42.577 4821 0.000 0011 MHz T^-1
267 proton mag. mom. 1.410 606 662 e-26 0.000 000 037 e-26 J T^-1
268 proton mag. mom. to Bohr magneton ratio 1.521 032 209 e-3 0.000 000 012 e-3
269 proton mag. mom. to nuclear magneton ratio 2.792 847 356 0.000 000 023
270 proton mag. shielding correction 25.694 e-6 0.014 e-6
271 proton mass 1.672 621 637 e-27 0.000 000 083 e-27 kg
272 proton mass energy equivalent 1.503 277 359 e-10 0.000 000 075 e-10 J
273 proton mass energy equivalent in MeV 938.272 013 0.000 023 MeV
274 proton mass in u 1.007 276 466 77 0.000 000 000 10 u
275 proton molar mass 1.007 276 466 77 e-3 0.000 000 000 10 e-3 kg mol^-1
276 proton-muon mass ratio 8.880 243 39 0.000 000 23
277 proton-neutron mag. mom. ratio -1.459 898 06 0.000 000 34
278 proton-neutron mass ratio 0.998 623 478 24 0.000 000 000 46
279 proton rms charge radius 0.8768 e-15 0.0069 e-15 m
280 proton-tau mass ratio 0.528 012 0.000 086
281 quantum of circulation 3.636 947 5199 e-4 0.000 000 0050 e-4 m^2 s^-1
282 quantum of circulation times 2 7.273 895 040 e-4 0.000 000 010 e-4 m^2 s^-1
283 Rydberg constant 10 973 731.568 527 0.000 073 m^-1
284 Rydberg constant times c in Hz 3.289 841 960 361 e15 0.000 000 000 022 e15 Hz
285 Rydberg constant times hc in eV 13.605 691 93 0.000 000 34 eV
286 Rydberg constant times hc in J 2.179 871 97 e-18 0.000 000 11 e-18 J
287 Sackur-Tetrode constant (1 K, 100 kPa) -1.151 7047 0.000 0044
288 Sackur-Tetrode constant (1 K, 101.325 kPa) -1.164 8677 0.000 0044
289 second radiation constant 1.438 7752 e-2 0.000 0025 e-2 m K
290 shielded helion gyromag. ratio 2.037 894 730 e8 0.000 000 056 e8 s^-1 T^-1
291 shielded helion gyromag. ratio over 2 pi 32.434 101 98 0.000 000 90 MHz T^-1
292 shielded helion mag. mom. -1.074 552 982 e-26 0.000 000 030 e-26 J T^-1
293 shielded helion mag. mom. to Bohr magneton ratio -1.158 671 471 e-3 0.000 000 014 e-3
294 shielded helion mag. mom. to nuclear magneton ratio -2.127 497 718 0.000 000 025
295 shielded helion to proton mag. mom. ratio -0.761 766 558 0.000 000 011
296 shielded helion to shielded proton mag. mom. ratio -0.761 786 1313 0.000 000 0033
297 shielded proton gyromag. ratio 2.675 153 362 e8 0.000 000 073 e8 s^-1 T^-1
298 shielded proton gyromag. ratio over 2 pi 42.576 3881 0.000 0012 MHz T^-1
299 shielded proton mag. mom. 1.410 570 419 e-26 0.000 000 038 e-26 J T^-1
300 shielded proton mag. mom. to Bohr magneton ratio 1.520 993 128 e-3 0.000 000 017 e-3
301 shielded proton mag. mom. to nuclear magneton ratio 2.792 775 598 0.000 000 030
302 speed of light in vacuum 299 792 458 (exact) m s^-1
303 standard acceleration of gravity 9.806 65 (exact) m s^-2
304 standard atmosphere 101 325 (exact) Pa
305 Stefan-Boltzmann constant 5.670 400 e-8 0.000 040 e-8 W m^-2 K^-4
306 tau Compton wavelength 0.697 72 e-15 0.000 11 e-15 m
307 tau Compton wavelength over 2 pi 0.111 046 e-15 0.000 018 e-15 m
308 tau-electron mass ratio 3477.48 0.57
309 tau mass 3.167 77 e-27 0.000 52 e-27 kg
310 tau mass energy equivalent 2.847 05 e-10 0.000 46 e-10 J
311 tau mass energy equivalent in MeV 1776.99 0.29 MeV
312 tau mass in u 1.907 68 0.000 31 u
313 tau molar mass 1.907 68 e-3 0.000 31 e-3 kg mol^-1
314 tau-muon mass ratio 16.8183 0.0027
315 tau-neutron mass ratio 1.891 29 0.000 31
316 tau-proton mass ratio 1.893 90 0.000 31
317 Thomson cross section 0.665 245 8558 e-28 0.000 000 0027 e-28 m^2
318 triton-electron mag. mom. ratio -1.620 514 423 e-3 0.000 000 021 e-3
319 triton-electron mass ratio 5496.921 5269 0.000 0051
320 triton g factor 5.957 924 896 0.000 000 076
321 triton mag. mom. 1.504 609 361 e-26 0.000 000 042 e-26 J T^-1
322 triton mag. mom. to Bohr magneton ratio 1.622 393 657 e-3 0.000 000 021 e-3
323 triton mag. mom. to nuclear magneton ratio 2.978 962 448 0.000 000 038
324 triton mass 5.007 355 88 e-27 0.000 000 25 e-27 kg
325 triton mass energy equivalent 4.500 387 03 e-10 0.000 000 22 e-10 J
326 triton mass energy equivalent in MeV 2808.920 906 0.000 070 MeV
327 triton mass in u 3.015 500 7134 0.000 000 0025 u
328 triton molar mass 3.015 500 7134 e-3 0.000 000 0025 e-3 kg mol^-1
329 triton-neutron mag. mom. ratio -1.557 185 53 0.000 000 37
330 triton-proton mag. mom. ratio 1.066 639 908 0.000 000 010
331 triton-proton mass ratio 2.993 717 0309 0.000 000 0025
332 unified atomic mass unit 1.660 538 782 e-27 0.000 000 083 e-27 kg
333 von Klitzing constant 25 812.807 557 0.000 018 ohm
334 weak mixing angle 0.222 55 0.000 56
335 Wien frequency displacement law constant 5.878 933 e10 0.000 010 e10 Hz K^-1
336 Wien wavelength displacement law constant 2.897 7685 e-3 0.000 0051 e-3 m K