🔍 Key Concepts

• Thermal expansion of liquids as temperature increases • Behavior of flammable and combustible liquids when stored in closed containers • Difference between something that truly remains constant and something that changes with temperature

💭 Think About

• When you heat most liquids, what generally happens to the spacing between their molecules? • If a liquid in a closed tank gets warmer, what must happen to its level or pressure inside the tank? • Which choice(s) claim no change in volume, and are those realistic for real liquids when temperature changes?

✅ Before You Answer

• Eliminate any answers that say the volume does not change when temperature changes, and ask if that fits real-world experience with liquids and fuel tanks. • Think about what happens to fuel in a storage tank on a hot day versus a cold day — does the liquid take up more or less space? • Remember that most exam questions assume normal, real-world behavior of liquids, not idealized ‘no-change’ conditions.