Table of Common Constants


Series of different colored lasers. No matter the color, the speed of light is a constant. The speed of light is just one constant in this table of common constants. Credit: Pang Ka kit, Creative Commons

Here is a useful table of common constants. These physical constants appear time and again in chemistry and physics homework problems.

Why memorize them when you can just look them up.

I personally prefer to keep a sheet with these constants stuffed in the back of book. You can print up your own sheet with a PDF copy of the Table of Common Constants.


 Name SymbolValue
Speed of lightc299792458 m⋅s-1
Charge of an electrone1.602176565(35)×10−19 C
Universal gravitational constantG6.67384(80)×10-11 N⋅m2/kg2
Planck’s constanth6.626070040(81)×10−34 J⋅s
h4.135667662(25)×10−15 eV⋅s
Dirac’s constantħ1.054571800(13)×10−34 J⋅s
ħ6.582119514(40)×10−16 eV⋅s
Boltzmann’s constantk1.3806488(13)×10−23 J⋅K-1
8.6173324(78)×10−5 eV⋅K-1
Avogadro’s constantNA6.022140857(74)×1023 mol−1
Faraday’s constantF96485.3365(21) C⋅mol−1
Ideal gas constantR8.3144621(75) J⋅K−1⋅mol−1
Mass of an electronme9.10938291(40)×10−31 kg
0.510998928(11) MeV/c2
Mass of a protonmp1.672621777(74)×10−27 kg
938.272046(21) MeV/c2
Mass of a neutronmn1.674927351(74)×10−27 kg
939.565378(21) MeV/c2
Atomic mass unitu, amu or Da1.660538921(73)×10−27 kg
931.494061(21) MeV/c2
Permittivity of free spaceε08.854187817×10−12
Coulomb’s constant1/4πε08.9875517973681764×109 N⋅m2⋅C-2
Permeability of free spaceμ04π×10−7 N⋅A-2
Rydberg constantR1.0973731568539(55)×10−7 m-1
Bohr radiusa05.2917721092(17)×10−11 m
Table of Common Constants
Last modified: September 3rd, 2015 by Todd Helmenstine

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