Mole Day is celebrated by chemists between 6.02 AM and 6.02 PM on this day because Avogadro’s number is 6.02×10to the power 23, the number of particles in one mole of substance.
Maurice Oehler, a retired chemistry teacher started to promote Mole day in 1991 to get students interested in chemistry.
– Posted by Douglas Racionzer (serendipiday.blogspot.com)