Question

what is liquid cooling in smartphones?

Answer 1

Your ANSWER-
Every processor on the planet creates heat. More precisely, computer chips convert electricalenergy into thermal energy. Even the most simple circuit has some amount of resistance, and that resistance is manifest in heat. It’s the nature of the beast. Electronics don’t particularly like heat – in fact, a circuit that runs too hot will eventually burn itself out. That’s where the genius of a liquid cooled smartphone comes in to play.
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Answer 2

Liquid would flow through some sort of housing that is next to the processor. As the liquid flows by, it absorbs heat. That liquid then goes by a fan or vent where the heat is expelled.

The idea is that the liquid absorbs most of the heat and brings it directly to the fan or vent so that less heat just sticks around the inside of the device.