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Surface area is a factor in the efficiency of heat exchange. A greater surface to mass ratio creates a faster transfer of heat. This is why the heat sink on your CPU has the multiple bars that increase its surface area. If it was just a solid cube (or worse yet a sphere), it would not have nearly the potential to remove heat from the CPU.

Other factors in heat loss or dissipation include temperature differential, humidity, air circulation, and the chemical composition of the materials used.

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Q: Does heat loss depend on surface area?
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