According to the kinetic molecular theory, matter is composed of microscopic particles that are in constant motion. The properties of matter, such as temperature and pressure, are determined by the motion of these particles. In a gas, the particles move freely and collide with each other and the walls of the container. The average kinetic energy of the particles is proportional to the temperature of the gas. The kinetic molecular theory explains many phenomena, including the behavior of gases, liquids, and solids, and has applications in fields such as chemistry and physics.
