What change in a gas’s volume occurs as its temperature increases, provided the pressure remains constant?

As the temperature of a gas increases while keeping the pressure constant, the gas molecules gain kinetic energy, which causes them to move more rapidly. This increased motion results in the gas molecules spreading apart, leading to an expansion of the gas. According to Charles's Law, at constant pressure, the volume of a gas is directly proportional to its temperature measured in Kelvin. Thus, as temperature rises, the volume increases. This relationship illustrates the fundamental concept of gas behavior under changing conditions, which is crucial for various applications in SCUBA diving, such as understanding how gas expands in tanks and the effects of temperature fluctuations on buoyancy.