Question

Substance
Copper
Iron
Water
Aluminum
Specific heat (cal/
B-°C
copper-0.095
iron-0.0115
water-1
aluminium-0.21
i) Which material is suitable as the base of the cooking vessel?
ii) Why do we prefer water as a coolant?​

Answer 1

Iron is most suitable

Water is preferred as coolant due to the fact that it doesn't retain heat for long and cools down surfaces. As it falls on a hot surface, a fraction of the water evaporates. As evaporation has a cooling effect, it is preferred as a coolant