Eli5- Why does water feel so much colder than air?

Question

When I’m at the beach and the water is around 23-25°C, it feels like touching ice but when air temperature ist around there, sometimes even topless it’s hot, even in the shadow. Or even if it’s cool, it doesn’t feel that cold

In: 6

Answer 1

Heat is transferred much more efficiently in water that air. I think something close to 40 times more efficiently.