Which law relates pressure and volume when temperature is constant?

Which law relates pressure and volume when temperature is constant?

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

Answer: (A)

At constant temperature, pressure and volume change in opposite ways. When you squeeze a gas into a smaller volume, more frequent collisions with the container walls raise the pressure; when the gas expands to a larger volume, pressure drops. This inverse relationship is captured by Boyle’s Law, which states that the product of pressure and volume remains constant as long as the temperature stays the same (P1V1 = P2V2). Understanding this helps explain practical situations like inflating or compressing a gas within a fixed-temperature environment. This differs from the other gas laws: Charles’ Law describes how volume changes with temperature at constant pressure; Gay-Lussac’s Law describes how pressure changes with temperature at constant volume; Avogadro’s Law links volume to the amount of gas at constant temperature and pressure.

At constant temperature, pressure and volume change in opposite ways. When you squeeze a gas into a smaller volume, more frequent collisions with the container walls raise the pressure; when the gas expands to a larger volume, pressure drops. This inverse relationship is captured by Boyle’s Law, which states that the product of pressure and volume remains constant as long as the temperature stays the same (P1V1 = P2V2). Understanding this helps explain practical situations like inflating or compressing a gas within a fixed-temperature environment.

This differs from the other gas laws: Charles’ Law describes how volume changes with temperature at constant pressure; Gay-Lussac’s Law describes how pressure changes with temperature at constant volume; Avogadro’s Law links volume to the amount of gas at constant temperature and pressure.