Eli5 If putting something under pressure increases the temperature why is the bottom of the ocean so cold?
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An increase in pressure will typically increase temperature. However this hand wavy rule refers to a closed system, and a pressure increase within that closed system. Neither of these are the case for the ocean.
The temperature of the bottom of the ocean is a result of fluid flow (heat rises) and very little energy ever making it to the bottom (absorption of atmospheric heating and sunlight by higher levels).
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