Avagadro's number: 6.02 x 10^23

[CoryDuchesne]

I realize that this number is the amount of atoms in a mole.

 

But does anyone have any idea how that figured that out way back in the 1800's?

[iNow]

Read this short one-page speech. It should help: http://nobelprize.org/nobel_prizes/physics/laureates/1926/press.html

 

 

If you want a longer, fuller treatise, go here: http://web.lemoyne.edu/~giunta/avogadro.html