[plug] Linux ideology (was: EduBDO/SIGfest)

[Craig Ringer]

>> "The mole is a unit that quantifies the presence of fundamental
>> particles of matter (such as atoms or molecules). One mole (1mol) of a
>> substance consists of approximately 6.022x10^23 particles (Avogadro's
>> number). The mole is convenient because the mass of one mole of an
>> element (its molar mass) is equal to its relative atomic mass."

Importantly,

> One mole is the number of atoms in precisely 12 thousandths of a kilogram (0.012 kg) of C-12, the most common naturally-occurring isotope of the element carbon. This number is equal to approximately 6.022169 x 1023, and is also called the Avogadro constant.
(http://whatis.techtarget.com/definition/0,,sid9_gci525907,00.html)

the basis of Avogadro's number.