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Originally Posted by BGP Spook
I understood everything you said Captain Slug except for the immediately above.
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It has to do with the thermal diffusivity of aluminum versus copper.
Say you take a copper heatsink and an aluminum heatsink, both with the same C/W rating and airflow, and then apply the same heat load for the same amount of time.
When the heatload is removed the aluminum heatsink will reach ambient temperature faster than the copper.
This works out positively when aluminum is used for air-cooling, but negatively in other applications such as waterblocks, phase-change evaporators, and Dry Ice/LN2 containers.