🔍 Key Concepts

• heat conduction vs. heat storage in boiler materials • thermal properties of metals vs. non‑metals • role of boiler construction materials in transferring heat from flame to water/steam

💭 Think About

• Think about which material would most quickly transfer heat from the furnace side to the water side of a boiler plate. • Ask yourself: in a boiler, what is usually used as the main shell/tube material where heat has to move efficiently? • Consider which of these substances is typically chosen in engineering when you need rapid heat transfer, not just capacity to hold heat.

✅ Before You Answer

• Compare the thermal conductivity of metals to that of water, steam, and brick. • Remember which of these materials is actually used for boiler tubes and shells in practice. • Distinguish between good insulators and good conductors of heat before picking your answer.