In a closed system with constant pressure, what happens to the volume when temperature increases?

When temperature increases in a closed system at constant pressure, the volume increases. This relationship is described by Charles's Law, which states that for a given mass of gas at constant pressure, the volume is directly proportional to its absolute temperature. As temperature rises, the kinetic energy of the gas particles increases, causing them to move more vigorously and occupy more space. Consequently, this increase in movement results in an expansion of the volume within the constraints of constant pressure.

This concept is fundamental in thermodynamics and illustrates how gases behave under changing thermal conditions. The other potential answers do not align with this principle; the volume cannot decrease or remain unchanged under these conditions, and fluctuations in volume would not be characteristic of a stable closed system experiencing a uniform temperature increase.