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  • The International System of Units (SI) and its Primary Standards for realization

Teachers and Students in Science, Technology, Engineering and Mathematics

The International System of Units (SI) and its Primary Standards for realization

  • Time (the second, s)
  • Caesium Beam Atomic Clock
  • Length (the metre, m)
  • Iodine Stabilized Helium-Neon Laser
  • Mass (the kilogram, kg)
  • Primary method for realizing the kilogram
  • Electric Current (the ampere, A)
  • Josephson Array Voltage Standard / Quantum Hall Resistance Standard
  • Thermodynamic Temperature (the kelvin, K)
  • Triple Point of Water Cell
  • Amount of Substance (the mole, mol)
  • Luminous Intensity (the candela, cd)
  • Cryogenic Radiometer