Eli5: How do heat sinks work?

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Curious how they work. Why do they look like lots of layers of fins.

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A processor can be an inch square, and puts out 100 watts of heat. The surface of it is too small to effectively cool off, so they attach a block of metal with fins. Metals conduct heat, and the fins increase the surface area so AIR can get in there and take on the heat. They also attach a fan to the fins to blow air over them to pick up the heat.

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