question_answer

Suppose you want to cool your drink. Should you keep ice cubes floating on the top or should you arrange to keep the ice cubes at the bottom?

Answer:

                Ice cubes should be kept floating in the drink. The liquid will then cool by convection. If the ice cubes are placed at the bottom, no convection currents are set up and liquid is not cooled. Also it cannot be cooled by conduction because liquid is a poor conductor of heat.