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 Avogadro's number, which is approximately 6.02×10²³, defining the number of particles (atoms or molecules) in a mole, one of the seven base SI units. October 23 is the 296th day of the year (297th in leap years) in the Gregorian calendar. ... Avogadros number, also called Avogadros constant (NA), named after Amedeo Avogadro, is formally defined to be the number of carbon-12 atoms in 12 grams (0. ... A mole (symbol: mol) is approximately 6. ... Cover of brochure The International System of Units. ...

History

The idea for Mole Day originated in an article in The Science Teacher in the early 1980s.^[1] Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.^[1] Main article: Secondary education High school is a name used in some parts of the world, and particularly in North America, to describe the last segment of compulsory secondary education. ... Chemistry (from Persian language کیمیا Kimia and Greek χημεία khemeia[1] meaning alchemy) is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms, such as gases, molecules, crystals, and metals. ... Sign seen in Prairie du Chien, WI on entering from Iowa. ... May 15 is the 135th day of the year in the Gregorian Calendar (136th in leap years). ... 1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. ...

How to celebrate

Many high schools around the United States and in Canada celebrate Mole Day as a way to get their students interested in chemistry. Art Logan, a chemistry teacher at Clio High School in Clio, Michigan, has provided a number of sample activities on the web page of the National Mole Day Foundation, Inc, a site which he maintains. Examples include "Scavenger Hunt - Create a list of household items but use chemistry terms for the items you want. Such as: Something that contains NaHCO₃," or "Write a Mole Day poem, story, or cartoon." Some teachers also have the class make mole (animal)-themed craft projects. Clio is a city located in Genesee County in the U.S. state of Michigan. ...

Alternate observances

• Some schools celebrate Mole Day on June 2 (6/02), rather than October 23 (10/23), presumably from 10:23 AM to 10:23 PM.
• Some schools celebrate "Mole Week" around October 23.

June 2 is the 153rd day of the year in the Gregorian calendar (154th in leap years), with 212 days remaining. ...

See also

• Pi Day
• Grav-mass

Pi Day and Pi Approximation Day are two unofficial holidays held to celebrate the mathematical constant π (Pi). ... Grav-mass is a fictitious, humor-laiden winter holiday established by Richard Stallman. ...

Frivolous holidays

• April Fools' Day
• International Talk Like A Pirate Day
• Sadie Hawkins Day

This article or section may contain original research or unverified claims. ... International Talk Like a Pirate Day is a parodic holiday invented in 1995 by two Americans, John Baur (Ol Chum Bucket) and Mark Summers (Capn Slappy), who proclaimed September 19 each year as the day when everyone in the world should talk like pirates. ... Sadie Hawkins Day was a day-long event in Al Capps comic strip Lil Abner, named after Sadie Hawkins, the homeliest gal in all them hills. ...

References

External links

• National Mole Day Foundation, Inc.
• Some Mole Day activities