Which law describes the relationship between temperature and gas pressure?

• A. Boyle's Law
• B. Charles's Law
• C. Gay-Lussac's Law
• D. Avogadro's Law

Answer: (C)

The relationship between temperature and gas pressure is described by Gay-Lussac's Law. This law states that, for a given mass of gas at constant volume, the pressure of the gas is directly proportional to its absolute temperature. In mathematical terms, this can be expressed as P/T = constant, where P is the pressure, T is the absolute temperature, and the constant represents the specific state of the gas.

As the temperature of a gas increases, the kinetic energy of the gas molecules increases, leading to more frequent and forceful collisions with the walls of the container. This results in an increase in pressure. Conversely, if the temperature decreases, the gas molecules lose kinetic energy, resulting in lower pressure.

Other laws pertain to different relationships involving gas. Boyle's Law addresses the relationship between pressure and volume at a constant temperature, while Charles's Law relates to the relationship between volume and temperature at constant pressure. Avogadro's Law focuses on the relationship between volume and the number of moles of gas at constant temperature and pressure. Thus, Gay-Lussac's Law specifically covers the important direct relationship between temperature and pressure that is critical in understanding gas behavior.