Mole Day is an unofficial holiday celebrated among chemists in North America on October 23, 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 the Avogadro constant, which is approximately 6.02×10²³, defining the number of particles (atoms or molecules) in a mole. Mole Day originated in an article in The Science Teacher in the early 1980s. Inspired by this article, a retired high school chemistry teacher founded the National Mole Day Foundation (NMDF.)

Many high schools around the United States, South Africa 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.

Since Mole Day images are under copyright, I’ll show an image of a different kind of mole found on Pixabay.