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Imagine you have a heater in a room. How does it heat the entire room when only the heater is hot? By convection!

As the heater warms the air around it, this warm air travels upwards. When it hits the ceiling of the room, it travels outward towards the walls (pushed away from center by the rising column of air) By the time it reaches the walls it has cooled slightly and sinks (remember hot air is lighter and rises, while cool air is denser and sinks). It then travels along the floor of the room pushed by the sinking column of cooler air until it reaches the heater. Then the cycle starts again. This circular movement of heat is called convection and is h ow heat is normally transferred in gases and liquids. Solids most frequently use a process called conduction but that is another story!

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13y ago
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Q: How would you define heat transfer by convection?
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