🔍 Key Concepts

• Heat value (calorific value) of a fuel • Difference between energy content and temperature/ignition point • What a BTU (British Thermal Unit) measures

💭 Think About

• Which choice talks about the energy released from the fuel, rather than cost, temperature, or quantity? • Does heat value describe a property that changes with market prices, or a physical property of the fuel itself? • Is heat value about how hard it is to start the fuel burning, or about what happens after it is burning?

✅ Before You Answer

• Identify which option refers to energy released per unit of fuel. • Eliminate any option that mentions cost or market value instead of a physical fuel property. • Eliminate any option that describes ignition temperature or how to start combustion, rather than what you get from combustion.