When heat is applied to liquid propane, what happens to its volume?

• A. It expands
• B. It remains the same
• C. It contracts
• D. It freezes

Answer: (A)

When heat is added to liquid propane, its volume increases. Heating gives the propane molecules more energy, causing them to move faster and push farther apart, which makes the liquid expand. Propane has a low boiling point, so as you continue to heat, it will begin to vaporize, and the resulting gas takes up much more space than the liquid, further increasing the overall volume. It doesn’t stay the same, it doesn’t contract, and it doesn’t freeze from heating.