EngiRef / Constants
Atomic Mass Unit
Unified atomic mass unit. 1/12 mass of ¹²C.
atomicu
Source Details
Id
u
Name
Atomic Mass Unit
Symbol
u
Value
1.6605390666e-27
Unit
kg
Category
atomic
Description
Unified atomic mass unit. 1/12 mass of ¹²C.
Constants
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Source collection
Speed of Light in Vacuum
Exact defined value in SI. Maximum speed in universe.
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Exact defined value in SI. Relates photon energy to frequency.
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Reduced Planck Constant
h/(2π). Common in quantum mechanics.
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Elementary Charge
Exact defined value in SI. Charge of a proton.
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Avogadro's Constant
Exact defined value in SI. Particles per mole.
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Gravitational Constant
Universal gravitation constant. F = GMm/r².
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