Which of the following correctly describes the relationship between variables in Boyle's Law?

• A. Pressure and temperature are directly proportional at constant volume.
• B. Pressure and volume are inversely proportional at constant temperature.
• C. Volume and the number of moles are directly proportional at constant temperature and pressure.
• D. Volume and temperature are directly proportional at constant pressure.

Answer: (B)

Verified step by step guidance

1. Identify the law being discussed: Boyle's Law, which describes the relationship between pressure and volume of a gas at constant temperature.
2. Recall the statement of Boyle's Law: At constant temperature, the pressure of a gas is inversely proportional to its volume.
3. Express Boyle's Law mathematically: \( P \propto \frac{1}{V} \) or \( PV = k \), where \( P \) is pressure, \( V \) is volume, and \( k \) is a constant.
4. Analyze the given options to determine which one aligns with the inverse relationship described by Boyle's Law.
5. Select the option that states: 'Pressure and volume are inversely proportional at constant temperature,' as it correctly describes Boyle's Law.