EngiRef / Constants

Planck Constant

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

fundamentalh

Source Details

Id

h

Name

Planck Constant

Symbol

h

Value

6.62607015e-34

Unit

J·s

Category

fundamental

Description

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

Constants

Related Content

Source collection

Speed of Light in Vacuum

Exact defined value in SI. Maximum speed in universe.

fundamentalc

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

Fine Structure Constant

Dimensionless. Characterizes electromagnetic interaction strength.

fundamentalα