Which law relates the volume and temperature of an ideal gas at constant pressure?

The law that relates the volume and temperature of an ideal gas at constant pressure is Charles's Law. This law states that the volume of a gas is directly proportional to its absolute temperature when pressure is held constant. In mathematical terms, it can be expressed as V/T = k, where V is the volume, T is the absolute temperature in Kelvin, and k is a constant value that depends on the amount of gas and the pressure.

Charles's Law highlights the relationship between temperature and volume, indicating that as the temperature of a gas increases, its volume also increases, provided the pressure remains unchanged. This behavior is a result of increased kinetic energy in the gas particles at higher temperatures, which causes them to move more vigorously and occupy a larger space.

Understanding this principle is essential in applications involving gases, such as weather balloons expanding in the heat of the sun or the operation of certain engines and refrigeration systems.