1. Gases Are Fluids:

Gases are fluids, which means that they flow just as liquids do. Gas molecules are in constant random motion and frequently collide with each other and the walls of their container. These collisions create pressure. These collisions are elastic, which means the molecules do not lose energy when they collide. They bounce around like flubber!
	Gas molecules travel in a straight-line motion until they collide with each other or the walls of their container.