Fundamental Physical Constantsaa

QuantitySymbolValue(s)
Atomic mass unit or Daltonamu, u, Da1.660538782 × 10−27 kg 931.494028 × 106 eV/c2
Avogadro numberL, NA6.02214179 × 1023 mol−1
Boltzmann constantk1.3806504 × 10−23 J K−1
Elementary chargee1.602176487 × 10−19 C
Gravitational constantG6.67428 × 10−11 m3 kg−1 s−2
Mass of electronme9.10938215 × 10−31 kg 8.18710438 × 10−14 J/c2 0.510998910 MeV/c2 5.4857990943 × 10−4 u
Mass of protonmp1.672621637 × 10−27 kg 1.503277359 × 10−10 J/c2 938.272013 MeV 1.00727646677 u
Molar gas constantR8.314472 J K−1 mol−1 0.08205746 L atm K−1 mol−1 K for kelvin
Permeability of vacuum Magnetic constantμ04π × 10−7 N A−2 N for newton and A for ampere.
Permittivity of vacuum Electric constantε08.854187817 × 10−12 F m−1
Planck constanth6.62606896 × 10−34 J s 4.13566733 × 10−15 ev s 6.62606896 × 10−27 erg s
Speed of light in vacuumc2.99792458 × 108 m/s
Stefan-Boltzmann constantσ5.670400 × 10−8 W m−2 K−4 W for watt

a Courtesy of the National Institute of Standards and Constants (NIST).

Get Quantum Physics for Scientists and Technologists: Fundamental Principles and Applications for Biologists, Chemists, Computer Scientists, and Nanotechnologists now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.