In a rigid container, if gas is heated, what happens to the pressure?

When a gas in a rigid container is heated, the kinetic energy of the gas molecules increases due to the added thermal energy. In a rigid container, the volume cannot change, so as the temperature rises, the molecules move more rapidly and collide with the walls of the container more frequently and with greater force.

According to Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its temperature when the volume is held constant, an increase in temperature results in an increase in pressure. Therefore, when the gas is heated, the pressure indeed increases as a direct response to the increased molecular motion and collisions against the container walls.

This concept is fundamental in understanding how temperature affects the behavior of gases under constraints, emphasizing the relationship between temperature, pressure, and the properties of gases in rigid containers.