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Physical Science of Water

Author(s): David R. Caprette, PhD

Behavior of Gas Molecules

Real gases appear to obey Avogadro's Principle up to a point. However, depending on the conditions of the experiment gases do not behave precisely as predicted by the gas laws that were developed on the basis of the work of Avogadro and other 19th and early 20th century chemists. 

Apparently, the assumptions on which Avogadro's Principle are based are not entirely true.