The kinetic theory of gases assumes that gas particles are negligible in size: 

• Small size: The total volume of the gas particles is negligible compared to the volume of the container. 
• Random motion: The particles are in constant, random motion. 
• No intermolecular forces: There is no force of attraction between the particles at normal temperatures and pressures. 
• Elastic collisions: Collisions between particles are elastic, meaning there is no net loss of energy. 
• Kinetic energy: The kinetic energy of the particles is proportional to temperature.