give reason why copper is used to make hot water tanks and not steel

Copper is used to make hot water tanks instead of steel primarily because copper resists corrosion much better than steel (which contains iron). Steel reacts with hot water and steam to form rust (iron oxide) and hydrogen gas, which weakens the tank over time. Copper, being lower on the reactivity series, does not react with hot water or steam, preventing rust and extending the tank's lifespan. Additionally, copper has a much higher thermal conductivity than steel, meaning it heats water more quickly and efficiently. This makes copper tanks more energy-efficient and better at delivering hot water promptly. In summary, copper's superior corrosion resistance and heat transfer properties make it more suitable than steel for hot water tanks.