A Molecular Model of Gases

• gases completely fill their containers

  • gas molecules in continuous motion?

• gases have low density & are easy to compress

  • gas molecules are far apart?

• gases are easy to expand

  • gas molecules don’t attract each other strongly?

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Average separation of molecules in gases ~10 x that in solids and liquids at normal T, P.

Density of gases is a thousand times less than for solids and liquids.