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 of substance, one of the seven base SI units.
Mole Day originated in an article in The Science Teacher in the early 1980s. Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.
Many high schools around the United States, South Africa, Australia and in Canada celebrate Mole Day as a way to get their students interested in chemistry, with various activities often related to chemistry or moles.
The American Chemical Society sponsors National Chemistry Week, which occurs from the Sunday through Saturday during October in which the 23rd falls. This makes Mole Day an integral part of National Chemistry Week.
- This Week in Chemical History, American Chemical Society, archived from the original on July 24, 2011, retrieved February 14, 2010
- "National Chemistry Week Celebrates 20 Years", Chemical & Engineering News, 85 (51), December 17, 2007, retrieved February 14, 2010
- "Chemistry In The Spotlight", Chemical & Engineering News, 88 (50), December 13, 2010, retrieved February 14, 2010
- "Chemical club wins national recognition". Central Michigan Life. September 27, 2004. Retrieved October 8, 2012.
- "History of National Mole Day Foundation, Inc". moleday.org.