# A List of Physics Constants

Physics constants are physical quantities with fixed numerical values. The following list contains the most common physics constants, including Avogadro’s number, Boltzmann’s constant, the mass of electron, the mass of a proton, the speed of light, the gravitational constant, and the gas constant.

• Avogadro’s number:

• Boltzmann’s constant:

• Mass of electron:

• Mass of proton:

• Speed of light:

• Gravitational constant:

• Gas constant: