Convection is one of the three modes of heat transfer possible. It is a process that is most common to liquids and gases. It is a type of heat transfer in which the liquid or gas is physically moving. Convection usually occurs in the presence of a temperature gradient. When the same liquid has different temperatures at different parts, convection occurs. The most simple example of this is when you heat a tub of water. The molecules closest to the flame gets heated first and when a liquid has more temperature it’s density decreases and therefore this water rises and then the water that has now replaced this gets heated up, it takes its place and this cyclic process repeats until the entire water body gets heated up. The process of convection even heats the air above the surface of the water and this is why when you keep your hand on top of a boiling tab you can also feel the heat.
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