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

All of the above answers are correct, however I would add that the increase in pressure is not enough, the substance must be compressed. Water is not “compressible”* in the same way as say, air … though sea water is somewhat more compressible than pure water, it world be essentially compressed to its maximum in a dixie cup.

*https://www.usgs.gov/special-topics/water-science-school/science/water-compressibility#:~:text=squeeze%22%20on%20water-,Water%20is%20essentially%20incompressible%2C%20especially%20under%20normal%20conditions.,back%22%20out%20of%20the%20straw.