The defining Constants of SI Units
November 29, 2024•51 words
• c: the speed of light in Vacuum.
• h: the Planck constant.
• e: elementary charge.
• ΔνCs
: the hyperfine transition frequency of cesium-133.
• k: the Boltzmann constant.
• NA: the Avogadro constant .
• Kcd
: the luminous efficacy of monochromatic radiation of frequency
540 × 1012hertz.