Which of the following is not a postulate of the Kinetic Theory of Matter? The pressure exerted by a gas in a container results from collisions between the gas molecules and the container walls. Collisions are perfectly elastic (i.e. they change directions and kinetic energy, and do not involve a loss of energy). Gases are composed of molecules that are in constant random motion, traveling in straight lines until they collide with each other or with the walls of their container. The temperature of the gas is independent of the kinetic energy of the gas molecules.
