Happy Mole Day! Usually, mole day is celebrated on October 23rd to celebrate Avogadro's Number, 6.022 x 10^23. This number is a way to measure how many small particles present in a particular area and is a standard unit of measure in chemistry. Today is a special day as today's date, 6/02/23 is also mole day! Cheers to this once in a lifetime day!