October 23

Mole Day honors Avogadro’s number, 6.02×10^23, the fundamental constant in chemistry representing a mole of substance. Observed annually on October 23 from 6:02 a.m. to 6:02 p.m., the event promotes chemistry education through fun activities, experiments, and contests. It originated in the 1980s through the American Chemical Society to engage students with the concept of the mole. Celebrations include classroom demonstrations, molecule-themed scavenger hunts, and social media challenges. Mole Day fosters enthusiasm for the chemical sciences and highlights the importance of precise measurement in scientific research.