Hot water is poured into an aluminum and glass pan of the same capacity.

Hot water is poured into an aluminum and glass pan of the same capacity. Which of the casseroles will heat up faster to the temperature of the water poured into it?

The thermal conductivity of aluminum is about 200 times greater than the thermal conductivity of the glass from which the pan is made. Accordingly, per unit of time, aluminum conducts (heats up) 200 times more thermal energy in joules. Therefore, an aluminum pan will heat up much earlier than a glass one, to the temperature of the poured water.