Which statement best describes Boyle's Law?

• A. At constant temperature, the pressure of a gas is directly proportional to its volume.
• B. At constant temperature, the pressure of a gas is inversely proportional to its volume.
• C. At constant pressure, the volume of a gas is directly proportional to its temperature.
• D. At constant volume, the pressure of a gas is directly proportional to its temperature.

Answer: (B)

Verified step by step guidance

1. Recall that Boyle's Law describes the relationship between pressure and volume of a gas when temperature is held constant.
2. Understand that Boyle's Law states that pressure and volume are inversely proportional, meaning as one increases, the other decreases.
3. Express Boyle's Law mathematically as \(P \times V = k\), where \(P\) is pressure, \(V\) is volume, and \(k\) is a constant for a given amount of gas at constant temperature.
4. Recognize that this means if volume decreases, pressure increases proportionally, and vice versa, as long as temperature does not change.
5. Compare the given statements and identify that the correct description of Boyle's Law is: 'At constant temperature, the pressure of a gas is inversely proportional to its volume.'