National Mole Day

Designed as a way to promote chemistry among adolescents, National Mole Day is a day celebrated on annually on October 23rd from 6:02 am to 6:02 pm on that day. It commemorates the basic measuring unit in chemistry called Avogadro’s Number – which is the number of units in one mole that equals 6.02×10^23. Although this holiday originated in the United States, it is now observed in schools all over the world, particularly in Canada, Australia and South Africa.


Sometime during the 1980s, a science teacher stated in an article in Science Teacher Magazine that a day should be created to celebrate the mole as a way to encourage science literacy among children. This article was read by Maurice Oehler – a retired chemistry teacher from Wisconsin – who was inspired by the article to create this non-official holiday. He did so on May 15th, 1991 by creating the National Mole Day Foundation (NMDF). Ever since then, the NMDF has worked hard to promote this holiday around the country as well as the world.

Customs, Traditions And Celebrations

This holiday is celebrated in schools all over the U.S and in some parts of the world. On this day, activities are designed by science teachers involving chemistry and the mole.

Where is National Mole Day celebrated?

There is no specific location where this holiday is celebrated.
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