Galaxy Note9: Water Carbon Cooling system from samsungmobilepress on Vimeo.
Way back when the Galaxy S7 and S7 edge were announced, the first teardowns of the handsets revealed some sort of a thin flat heat pipe running away from the processor area, presumably a cooling effort. The same ones were spotted before on Sony's high-end Xperias, starting with the Z2, or even the Lumia 950XL.
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