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 | NA = 6.022 × 1023 mol−1 |
Boltzmann's constant | kB = 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 | μ0 = 4π × 10−7 N/A2 |
Newton's constant | G = 6.674 × 10−8 cm3/g/s2 |
Permittivity of the vacuum | ε0 = 8.854 × 10−12 C2/N/m2 |
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 × 105 cm−1 |
Speed of light | c = 2.998 × 1010 m/s |
Stefan-Boltzmann constant | σ = 5.670 × 10−8 W/m2/K4 |
Particle Property | Approximately |
Electron mass | me = 9.109 × 10−28 g = 511 keV/c2 |
Pion mass | mπ = 139.6 MeV/c2 (π±), 135.0 MeV/c2 (π0) |
Kaon mass | mK = 493.7 MeV/c2 (K±), 497.6 MeV/c2 (K0) |
Nucleon mass | mN = 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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send feedback and suggestions to bombelli at olemiss.edu – modified 27 apr 2016