Which law describes the relationship between pressure and volume at constant temperature?

Which law describes the relationship between pressure and volume at constant temperature?

• A. Charles' Law
• B. Avogadro's Law
• C. Hooke's Law
• D. Boyle's Law

Answer: (D)

Focusing on how pressure and volume relate when temperature stays the same shows an inverse relationship: as volume goes down, pressure goes up, and as volume goes up, pressure goes down. This is Boyle's Law, which for a fixed amount of gas says P ∝ 1/V (P V = constant). The reasoning is that with less space, gas molecules collide with the container walls more often, increasing pressure; with more space, collisions lessen, reducing pressure. The other laws describe different scenarios: Charles' Law links volume to temperature at constant pressure, Avogadro's Law links volume to the amount of gas at fixed T and P, and Hooke's Law describes springs, not gases.

Focusing on how pressure and volume relate when temperature stays the same shows an inverse relationship: as volume goes down, pressure goes up, and as volume goes up, pressure goes down. This is Boyle's Law, which for a fixed amount of gas says P ∝ 1/V (P V = constant). The reasoning is that with less space, gas molecules collide with the container walls more often, increasing pressure; with more space, collisions lessen, reducing pressure. The other laws describe different scenarios: Charles' Law links volume to temperature at constant pressure, Avogadro's Law links volume to the amount of gas at fixed T and P, and Hooke's Law describes springs, not gases.