Convection is heat that is transferred through air currents and can happen in liquids or gases. Hot air has much faster atoms that are further apart then colder air. In addition, hot air is less dense than the much heavier cold air surrounding it. So the cold air falls down, pushing the hot air back up. This produces a convection current. An example of convection is when you turn on your heater or furnace. The furnace takes the air from outside and heats it up, and when its heated it spreads the air throughout the vents in the house. Once through the vents, the air spreads throughout the house, making it warm.
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