Ice cubes float in a glass of iced tea because due to a lack of convection, ice cubes will cool more slowly if they are on the bottom. Ice is denser than water at 4° C.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but the fluid motion is responsible for the bulk of the heat transfer.
Natural convection is caused by the fact that most fluids have a tendency to expand when heated, which causes them to become less dense and rise due to the increased buoyancy. Heat is transferred between two bodies by currents of moving gas or fluid, which is known as convection. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.
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