Physical Constants
Reference
symbol | name | value | |||
---|---|---|---|---|---|
c | speed of light in a vacuum |
299 792 458 m/s | |||
G | gravitational constant |
6.674 30 |
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h | Planck constant |
6.626 070 15 4.135 667 696 9 |
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hc | h c |
1.986 445 857 1 239.841 984 |
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|
h bar, reduced Planck constant, Dirac constant |
1.054 571 817 6.582 119 570 |
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fCs | hyperfine transition of 133Cs |
9 192 631 770 |
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e | elementary charge |
1.602 176 634 |
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ε0 | electric constant, permitivitty of free space, vacuum permitivitty |
8.854 187 812 8 |
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μ0 | magnetic constant, permeability of free space, vacuum permeability |
1.256 637 062 12 |
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NA | Avogadro constant |
6.022 140 76 |
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k | Boltzmann constant |
1.380 649 |
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R = NAk | gas constant |
8.314 462 618 |
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|
Stefan-Boltzmann constant |
5.670 374 419 |
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b | Wien displacement constant |
2.897 771 955 58.789 257 57 |
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mu | atomic mass constant |
1.660 539 066 60 931.494 102 42 MeV/c2 1 u |
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me | electron mass |
9.109 383 701 5 0.510 998 950 00 MeV/c2 5.485 799 090 65 |
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mp | proton mass |
1.672 621 923 69 938.272 088 16 MeV/c2 1.007 276 466 621 u |
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mn | neutron mass |
1.674 927 498 04 939.565 420 52 MeV/c2 1.008 664 915 95 u |
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Kcd | luminous efficacy |
683 lm/W | |||
H0 | hubble constant* |
69.3 km/s/Mpc 2.25 |