EngiRef / Constants

Speed of Light in Vacuum

Exact defined value in SI. Maximum speed in universe.

fundamentalc

Source Details

Id

c

Name

Speed of Light in Vacuum

Symbol

c

Value

299792458

Unit

m/s

Category

fundamental

Description

Exact defined value in SI. Maximum speed in universe.

Constants

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Source collection

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

Fine Structure Constant

Dimensionless. Characterizes electromagnetic interaction strength.

fundamentalα