Eli5 If putting something under pressure increases the temperature why is the bottom of the ocean so cold?

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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 temperature doesn’t come “from” the pressure. When something (typically a gas) gets compressed, the existing heat gets concentrated into a smaller area. No heat is added to the system.

Water is (almost) non-compressible. No heat gets added, and (almost) no heat gets concentrated.

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