Science without religion is lame. Religion without science is blind.
-- Albert Einstein
Below are a few physical constants that are useful. There is also a wall chart and wallet card pdf files from the NIST.
| Quantity | symbol | Value | Unit | notes |
| Speed of Light | c | 299792458 | m/s | Exact value in vacuum |
| Gravitational Constant | G | 6.67430e-11 | m^3 kg^-1 s^-2 | |
| Elementary Charge | e | 1.602176634e-19 | Coulombs | exact value |
| Magnetic Permeability | u0 | 1.25663706212e-6 | N A^-2 | u0/(4 pi * 10^-7) = 1.0000 |
| Electric Permittivity | E0 | 8.8541878128e-12 | F m^-1 |