A person does not feel cool in air at a temperature of 20 ° C, but in water he feels cold even at 25 ° C. Why?

This difference in the sensitivity of a person in water and in air is explained by several factors:

1) Most often, a person is in the air in clothes, and in the water without clothes.

2) The thermal conductivity of water is higher than that of air. That is, water promotes a faster outflow of heat from the human body than air.