Avogadro's number
Avogadro's number, also called Avogadro's constant (NA) is a large constant used in chemistry and physics. Avogadro's number is formally defined as the number of carbon-12 atoms in 12 grams (0.012 kg) of carbon-12, which is approximately 6.022 × 1023. Historically, carbon-12 was chosen as the reference substance because its atomic mass could be measured particularly accurately.
External links
- Some Notes on Avogadro's Number, 6.022 x 1023 (historical notes)
- 2002 CODATA value of Avogadro's number at NIST site
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