Place a plastic bag inside and out, feel the air pushing against the bag. Third, place a paper towel inside of a beaker. Put the beaker down into a container of colored water. Decide if the water wet the towel. Using the model of a molecule chamber, explain that the movement of the molecules represents gases, liquids and solids.
Gases move and flow more freely than the others.
Its particles constantly strike the walls and bounce off. The molecules of a liquid are packed less closely together than those in a solid. It takes the shape of a container. A solid's molecules are packed close together and stay in place. A solid has a definite shape.