National Mole Day - October 23
Sun, Oct 23, 2022

National Mole Day

National Mole Day is celebrated on October 23 around the world. It’s about a basic chemical algorithm, not about an animal burrowing underground. Although, if you want, you can celebrate a double holiday! So, “Avogadro’s Number”… Find out more about it!


National Day has its origins in 1980. This was facilitated by an article in the journal The Science Teacher. One teacher at Prairie du Chien High School was so inspired by what he read that he decided to create an official holiday. It was originally celebrated in May, then it was moved to October. In 1991, the National Mole Day Foundation (NMDF) was created to commemorate the day.

Interestingly, the celebrations take place at a certain time: from 6:02 to 18:02. The numbers are derived from the Avogadro number (approximately 6,02×10^23). The hypothesis states that equal volumes of different gases contain the same number of molecules. Invented the law by Amadeo Avogadro. He was born in 1776 and became one of the famous founders of physical chemistry. True, he was recognized by him only 50 years after his death.

Interesting facts

Did you know that:

  • the impulse to active experiments for Amadeo was the discovery of Gay-Lussac’s gas laws;
  • a crater on the moon is named after the chemist;
  • the scientific activity of the scientist began with the study of electrical phenomena;
  • Initially, the hypothesis was rejected by most chemists – in their opinion, it did not correspond to experimental data.

How to celebrate

Falling in love with chemistry is the best option to celebrate the day! This is an amazing, spectacular and beautiful science: if you understand its essence, then it is easy to “drown” in it with your head! Tell the children about the law, explain its essence, show with examples. Test your knowledge of chemistry – there are many tests on the Internet. Buy a white T-shirt and print Avogadro’s number on it – this way you will definitely attract even strangers to the holiday. Meet other chemists of this era.

When is National Mole Day celebrated in 2022?

National Mole Day is observed on October 23 each year.


Weekday Month Day Year
Sunday October 23 2022
Monday October 23 2023
Wednesday October 23 2024
Thursday October 23 2025
Friday October 23 2026

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