The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants

Constants
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Values
Energy
Equivalents
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Constants
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Constants,
Units &
Uncertainty
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Search results matching " xray_in "...

Angstrom star
Copper x unit
lattice parameter of silicon
lattice spacing of ideal Si (220)
molar volume of silicon
Molybdenum x unit


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If you did not find what you are looking for, perhaps it is not a fundamental physical constant.