" (Avogadro) His most well-known contribution to the field of chemistry was the statement titled; the Avogadro constant or Avogadro number. Avogadro stated that "a mole equals 6.022 x 1023." (American) It also states that equal volumes of gases, at the same temperature and pressure have the same amount of molecules.

Avogadro's number really means the number of molecules in a mole. His number is essential in chemistry because it calculates the amount of pure substances in stoichiometric relationships. It also determines how much heavier a simple molecule of one gas is than that of another. This number is also very large 6.0221367x10^23. However, Avogadro only hypothesized this and he was not responsible for calculating it, Loschmidt was. (Furtsch)

Even though, Avogadro was not fully...

His curiosity led him to create wonders in the science field, which in turn has changed how we look and use chemistry today.
Works Cited

Determination of the Avogadro Constant. 1974. American Physical Society, Washington D.C. 17 June 1974

http://link.aps.org/abstract/PRL/v33/p463

Furtsch, T.A. "Some Notes on Avogadro's Number" Online posting. Tennessee Technological University. 12 January 2007. http://gemini.tntech.edu/~tfurtsch/scihist/avogadro.htm

The Avogadro Number. 1996. University of West Indies, Mona Campus, Jamaica, 1 April 2002. http://wwwchem.uwimona.edu.jm:1104/courses/pH/avono.html