Answer:
Gas particles are in constant random motion describes how gas particles collide.
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"Collisions between gas particles and the walls of a container" describes Kinetic Molecular Theory of Gases also explains other properties of gases, such as their volume, temperature, and density.
"Gas particles do not attract or repel one another" describes kinetic theory of gases. This is why gases can fill up a space completely, like a balloon. Gases are different from liquids and solids, which do stick together and have a fixed shape.