What does the kinetic molecular theory explain?

The kinetic molecular theory provides a framework for understanding the behavior of gases through the motion of their particles. It posits that gases are composed of a large number of small particles that are in constant, random motion. This motion is influenced by factors such as temperature, which is a measure of the average kinetic energy of the particles. According to this theory, the pressure exerted by a gas results from collisions between the gas particles and the walls of their container.

The key aspects explained by the kinetic molecular theory include the relationships between temperature, pressure, and volume in gases, as articulated in the ideal gas law. It also accounts for how gas particles occupy space and how their velocities change with temperature. This thorough understanding underscores why option B is the most appropriate choice, as it directly captures the essence of the kinetic molecular theory in relation to gas behavior.