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http://physics.nist.gov/cuu/

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• The NIST Reference on Constants, Units, and Uncertainty
  Official NIST reference providing essential information and background information. Includes: Values of the fundamental physical constants and related information, Searchable bibliography on the constants, In-depth information on the SI, the modern metric system, and Guidelines for the expression of uncertainty in measurement.
  Official NIST reference providing essential information and background information. Includes: Values of the fundamental physical constants and related information, Searchable bibliography on the constants, In-depth information on the SI, the modern metric system, and Guidelines for the expression of uncertainty in measurement.
  constants conversion conversions convert energy factors fundamental international light planck speed system units values
  By richter in Fyzika > Fyzikální vzdělávání, zdroje pro učitele > On line materiály with fyzika fyzikální line materiály pro uitele vzdlávání zdroje

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