Why do computers need to be cooled?
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Because the electricity used to do the valuation gets converted to heat if they get too hot they will do stuff incorrectly and at an even higher temperature get destroyed.
If you use low-performance CPUs they can be passivity cooled by the surrounding air, cellphones do that but high-performance computers need an active system like fans to keep them cool. It is possible to a higher-performance computer passively too the problem is heat sinks will be impractically large, heavy, and expensive.
Your brain do the same thing, the energy that is used becomes heat. If you can get cooled down by the environment you will overheat and die.
Your body does use a way of active cooling. If you walk you on in general not get too warm. If you run you use more energy and produce more heat. The active cooling system we have is sweating, the water requires energy to evaporate and it cools us down.
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