EngiRef / Fundamental Constant

Fine Structure Constant

Fine Structure Constant (α) = 0.00729735257. Dimensionless. Characterizes electromagnetic interaction strength. A fundamental constant in the free EngiRef…

fundamentalα

Specification

Name
Fine Structure Constant
Symbol
α
Value
0.00729735257
Category
fundamental
Description
Dimensionless. Characterizes electromagnetic interaction strength.

Constants

Related constants

Scientific constants

Speed of Light in Vacuum

Exact defined value in SI. Maximum speed in universe.

fundamentalc

Planck Constant

Exact defined value in SI. Relates photon energy to frequency.

fundamentalh

Reduced Planck Constant

h/(2π). Common in quantum mechanics.

fundamentalℏ

Elementary Charge

Exact defined value in SI. Charge of a proton.

fundamentale

Avogadro's Constant

Exact defined value in SI. Particles per mole.

fundamentalNᴀ

Gravitational Constant

Universal gravitation constant. F = GMm/r².

fundamentalG