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Mass of Gases <\/strong><\/p>\n In some previous lessons we have gone over mass and density<\/a> differences in solids, liquids, and gasses. (Mass= Density x volume<\/strong>) We have looked at the relative density of solid objects<\/a>, but this lesson goes over gases with different masses. For this lesson we watched several clips from science demonstrations by Dr. Shakhashiri. He was my chemistry professor for freshman chemistry. Every year he does a science demonstration show, and you can find detailed explanations of the experiments that he does on his website<\/a> and in his books.<\/p>\n