What happens to gas volume when temperature increases at a constant pressure?

When the temperature of a gas increases while maintaining a constant pressure, the volume of the gas expands. This behavior is described by Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvin) when the pressure is kept constant.

As temperature rises, the kinetic energy of the gas molecules increases, causing them to move more vigorously and collide with the walls of their container more frequently and forcefully. This increased movement leads to an expansion of the gas, resulting in a larger volume. Therefore, under the conditions described—constant pressure and increasing temperature—the gas volume will increase. This principle is fundamental in thermodynamics and is observed in many practical scenarios, such as in hot air balloons or internal combustion engines.