Mole Day is an unofficial holiday celebrated among chemists, chemistry students and chemistry enthusiasts on October 23, between 6:02 a. m. and 6:02 p. m. , making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from Avogadro's number, which is approximately 6. 02 × 1023, defining the number of particles (atoms or molecules) in one mole (mol) of substance, one of the seven base SI units.
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