Here is a useful table of common physical 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 my textbook. You can download and print up your own list of important physical constants using the link below.
Physical Constants PDF Download
Common Physical Constants
| Name | Symbol | Value |
| Speed of light | c | 299792458 m⋅s-1 |
| Charge of an electron | e | 1.602176565(35)×10−19 C |
| Universal gravitational constant | G | 6.67384(80)×10-11 N⋅m2/kg2 |
| Planck’s constant | h | 6.626070040(81)×10−34 J⋅s |
| h | 4.135667662(25)×10−15 eV⋅s | |
| Dirac’s constant | ħ | 1.054571800(13)×10−34 J⋅s |
| ħ | 6.582119514(40)×10−16 eV⋅s | |
| Boltzmann’s constant | k | 1.3806488(13)×10−23 J⋅K-1 |
| 8.6173324(78)×10−5 eV⋅K-1 | ||
| Avogadro’s constant | NA | 6.022140857(74)×1023 mol−1 |
| Faraday’s constant | F | 96485.3365(21) C⋅mol−1 |
| Ideal gas constant | R | 8.3144621(75) J⋅K−1⋅mol−1 |
| Mass of an electron | me | 9.10938291(40)×10−31 kg |
| 0.510998928(11) MeV/c2 | ||
| Mass of a proton | mp | 1.672621777(74)×10−27 kg |
| 938.272046(21) MeV/c2 | ||
| Mass of a neutron | mn | 1.674927351(74)×10−27 kg |
| 939.565378(21) MeV/c2 | ||
| Atomic mass unit | u, amu or Da | 1.660538921(73)×10−27 kg |
| 931.494061(21) MeV/c2 | ||
| Permittivity of free space | ε0 | 8.854187817×10−12 C2/N·m2 |
| Coulomb’s constant | 1/4πε0 | 8.9875517973681764×109 N⋅m2⋅C-2 |
| Permeability of free space | μ0 | 4π×10−7 N⋅A-2 |
| Rydberg constant | R∞ | 1.0973731568539(55)×10−7 m-1 |
| Bohr radius | a0 | 5.2917721092(17)×10−11 m |