Question

Sweating cools your body by

Group of answer choices

the surface tension of water molecules beading on the surface of the skin

dissolving salt into the sweat

releasing heat because droplets of water can hold a lot of heat

being a good insulator for heat

Answer 1

Option 1 is wrong :- The surface tension of water molecules beading on the surface of the skin.
The surface tension of the water molecules holds them together due to hydrogen bonds and does not allow them to escape into the environment, if the water molecules are not escaped it does not allow cooling of the body because the heat is not transferred into the environment.

Option 2 is wrong :- Dissolving salt into the sweat.
The salt is dissolved into sweat to maintain the sodium balance in the body which is done by endocrine system, dissolving salt into sweat does not cause the cooling of the body, the only thing it can do is to maintain the sodium balance because if it not maintained the body does work properly and damages the muscles too.

Option 3 is correct :- Releasing heat because droplets of water can hold a lot of heat.
When a person perform an exercise the body heats up because more energy is produced in the muscles this energy is transferred towards the surface and the body releases moisture onto the skin. This moisture is nothing but the water molecules the excess of energy given out to the water molecules present on the surface of the skin, due to this energy the kinetic energy of the water molecules increases and they leave the surface of the skin. More the kinetic energy more is the heat. When water molecule with high kinetic energy leave the body surface most of the heat is lost, this continues and the body temperature cools down.

Option 4 is wrong :- Being a good insulator for heat.
Insulator of heat is anything which does not pass or let the heat travel through it. Water is a good insulator but this property alone cannot help the body to cool down.