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Gay-Lussac's law describes the relationship between the pressure, volume, and temperature of a gas sample. It states that the pressure of a gas is proportional to its temperature when the volume of the gas is constant. This law can be expressed mathematically as P/T = constant. This means that as the temperature of a gas increases, the pressure of the gas will also increase, and vice versa. Gay-Lussac's law is used in a variety of applications, such as calculating the pressure of a gas in a container, determining the temperature at which a gas will liquefy, and designing experiments involving gases.