Values of Physical Constants |
Approximate Numerical Values > s.a. anthropic
principle; solar planets; types
of particles; units.
* Table: To three or four significant digits,
the values of some of the most commonly used physical constants are:
Name | Approximately |
Avogadro's number | N_{A} = 6.022 × 10^{23} mol^{−1} |
Boltzmann's constant | k_{B} = 1.381 × 10^{−16} erg/K = 1.381 × 10^{−23} J/K |
Electron charge | e = 1.602 × 10^{−19} C |
Fine-structure constant | α = 1/137 = 0.007299 |
Gas constant | R = 8.314 J · mol/K |
Molar gas constant | R = 1.987 cal/mol/K |
Magnetic permeability | μ_{0} = 4π × 10^{−7} N/A^{2} |
Newton's constant | G = 6.674 × 10^{−8} cm^{3}/g/s^{2} |
Permittivity of the vacuum | ε_{0} = 8.854 × 10^{−12} C^{2}/N/m^{2} |
Planck's constant | h = 6.62607 × 10^{−27} erg · s = 6.62607 × 10^{−34} J · s |
\(\hbar\) = 1.05457 × 10^{−27} erg · s = 1.05457 × 10^{−34} J · s | |
Rydberg constant | R_{∞} = 1.097 × 10^{5} cm^{−1} |
Speed of light | c = 2.998 × 10^{10} m/s |
Stefan-Boltzmann constant | σ = 5.670 × 10^{−8} W/m^{2}/K^{4} |
Particle Property | Approximately |
Electron mass | m_{e} = 9.109 × 10^{−28 }g = 511 keV/c^{2} |
Pion mass | m_{π} = 139.6 MeV/c^{2} (π^{±}), 135.0 MeV/c^{2} (π^{0}) |
Kaon mass | m_{K} = 493.7 MeV/c^{2} (K^{±}), 497.6 MeV/c^{2} (K^{0}) |
Nucleon mass | m_{N} = 1.67 × 10^{−24} g |
@ References: Mohr & Taylor RMP(05) [2002 values];
Mohr et al RMP(12)-a1203 [2010 values].
> Online resources:
NIST website;
Particle Data Group website
and PDG Live website.
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