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

Question

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

In: 561

Answer 1

The pressure isn’t what causes the heat, it’s the change in pressure that causes a change in temperature.

The bottom of the ocean has been under pressure long enough that any heat that the creation of the pressure created has long since dissipated. The bottom of the ocean is so cold because there is simply nothing to heat it up. The sun can only heat the surface of the ocean, and only small parts of the ocean floor have volcanic vents.