You may be thinking that this day is in honor of the little burrowing creature however, it is not.  National Mole Day is celebrated by chemists and chemistry students  each year on the 23rd of October,

This celebration takes place between 6:02 AM and 6:02 PM, 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 6.02×10^23, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.

  • Mole is a unit of measurement used in chemistry to express amounts of a chemical substance.
  • Avogadro’s number, is a historical term closely related to the Avogadro constant.
  • The Avogadro constant is named after the early 19th century Italian scientist Amedeo Avogadro.


Post on social media using #NationalMoleDay to spread the word.


National Mole Day, an “unofficial” national holiday originated in the early 1980′s in an article in The Science Teacher.  Prairie du Chien, Wisconsin  High School chemistry teacher was inspired by the article and founded the National Mole Day Foundation on May 15, 1991.


2 Responses to “NATIONAL MOLE DAY – October 23”


  1. October 22 – National Nut Day | One Day At A Time - October 22, 2014

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    […] National Mole Day […]

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