why does it hurt more to jump 10m into cold river water than warm pool water?

Question

Ive noticed this when I go cliff jumping. When I land it hurts more than at a pool.

-Water depth is deep; negligible

-Water temp in river is 9C

-Water temp in pool is about 28C

So does air solubility have anything to do with it? Or water density? Or is it just a placebo effect?

In: 2

Answer 1

Short answer is, yes, cold temperatures can in fact make water more dense, salt water is also more dense, so jumping into cold water is denser than warm, and jumping into salt water is denser than fresh, so cold salt water is definitely going to be more dense than a warm pool.