Why do gases obey the simple ideal gas law so well? Even gases made up of more complex entities than just individual atoms behave the same way. This fact suggests that the internal structure of the entities has little, if anything, to do with the gas law. The observed similarities of the properties of all gases must arise from similar properties of the atoms or molecules themselves. What then is the least we need to assume about the particles of gas that will explain the gas law?
KeywordsFree Path Atomic Model Helium Atom Nitrogen Molecule Average Kinetic Energy
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