The Avogadro's law reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Avogadro's law

Avogadro's law is a gas law discovered by Amedeo Avogadro, dictates that the number of molecules in a specific volume of gas is dependent on its pressure and temperature.

The law has three facets:

• The amount of moless is directly proportional to the gas' volume
• The amount of moles is proportional to its pressure
• The amount of moles is inversely proportional to its temperature

Multiply all that by a constant to make an equality instead of a proportion and you get:

Where R is equal to 8.31 (kPa × L)/(K × mol), and n represents one mole.

One mole occupies approximately 22.4 Liters at STP.

The number of molecules in one mole is called Avogadro's number.

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