Boyle's Law describes the relationship between pressure and volume at constant temperature. What is the relation?

• A. As temperature increases, volume increases
• B. As pressure increases, volume decreases
• C. Volume remains constant
• D. Pressure remains constant

Answer: (B)

At constant temperature and for a fixed amount of gas, pressure and volume are linked in an inverse way: when you squeeze the gas harder, its volume drops; when you loosen it, the volume increases. This is Boyle’s law, often written as P × V = constant. So the statement that best fits is that as pressure increases, volume decreases. For example, doubling the pressure at the same temperature reduces the volume to half. The other options don’t describe this inverse relationship: changing temperature affects volume differently (that’s a different gas law), and having volume or pressure remain unchanged contradicts the idea that squeezing the gas changes one to adjust the other.