The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants
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Constants,
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Constants in the category " Defined constants "...

Avogadro constant
Boltzmann constant
elementary charge
hyperfine transition frequency of Cs-133
luminous efficacy
Planck constant
reduced Planck constant
speed of light in vacuum
standard acceleration of gravity
standard atmosphere
standard-state pressure


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