What is the relationship between pressure and volume according to Boyle's Law?

• A. Direct relationship
• B. Inverse proportional relationship
• C. Direct proportional with temperature
• D. Logarithmic relationship

Answer: (B)

Pressure and volume move in opposite directions when temperature is held constant. Boyle's Law says P × V = constant, so as volume increases, pressure decreases in inverse proportion, and as volume decreases, pressure increases. This means doubling the volume roughly halves the pressure (for an ideal gas). A simple way to see it is with a syringe: pushing to lower the volume raises pressure; pulling to increase the volume lowers pressure. The other options don’t fit because a direct relationship would mean pressure rises with volume, and including temperature or a logarithmic form isn’t what Boyle’s Law describes.