Steam, hot air, and smoke are examples of convection because convection is the transfer of heat through the movement of a fluid or gas. In this case, the fluid or gas is the steam, hot air, and smoke. Convection occurs when the fluid or gas is heated, becomes less dense, and rises, carrying the heat energy with it. This creates a continuous cycle of rising and falling, transferring heat from one place to another. Therefore, steam, hot air, and smoke are all examples of convection.