Mole Day

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Mole Day is an unofficial holiday celebrated among chemists, chemistry students and chemistry enthusiasts on October 23, between 6:02 AM and 6:02 PM,[1][2][3] 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.[4] 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.[4]

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.


Year Theme[5]
1991 The Mole The Merrier
1992 Go For The Mole
1993 Mole Out The Barrel
1994 An Ace in The Mole
1995 Moledi Gras
1996 Molemorial Day
1997 We Dig Chemistry
1998 Ride the Molercoaster
1999 It's A MOLE World
2000 Celebrate the Molennium
2001 Molar Odyssey
2002 Molar Reflections
2003 Rock "n" Mole
2004 Pi a la MOLE
2005 Moles-Go-Round
2006 Mole Madness
2007 Secret Agent Double Mole Seven in Moles are Forever
2008 Remember the Alamole
2009 Molar Express
2010 Moles of the Caribbean
2011 Moles of the Round Table
2012 Molar Eclipse
2013 Animole Kingdom
2014 Mole-O'Ween

Alternate observances[edit]

  • Some schools celebrate "Mole Week" around October 23.[6]
  • The American Chemical Society sponsors National Chemistry Week,[2] 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.

See also[edit]


  1. ^ This Week in Chemical History, American Chemical Society, retrieved 2010-02-14 
  2. ^ a b "National Chemistry Week Celebrates 20 Years", Chemical & Engineering News 85 (51), December 17, 2007, retrieved 2010-02-14 
  3. ^ "Chemistry In The Spotlight", Chemical & Engineering News 88 (50), December 13, 2010, retrieved 2010-02-14 
  4. ^ a b "History of National Mole Day Foundation, Inc.". 
  5. ^ "National Mole Day Foundation, INC". 2011-11-18. Retrieved 2012-10-23. 
  6. ^ "Chemical club wins national recognition)". Central Michigan Life. 27 September 2004. Retrieved October 8, 2012. 

External links[edit]