LIFE SCIENCE

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OBJECTIVE LIFE SCIENCE

MOLECULAR BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why do we sweat? When water evaporates, it ____ a lot of energy from the system due to the fact that it has a high latent heat of evaporation. This is felt as a ____ sensation.
A
removes, cooling
B
removes, heating
C
adds, cooling
D
adds, heating
Explanation: 

Detailed explanation-1: -Humans use perspiration from the skin as one means of thermoregulation, because it has a cooling effect due to the latent heat of evaporation of water.

Detailed explanation-2: -Evaporation of the sweat from the skin causes a cooling effect. This is because water droplets present on the skin require some heat to evaporate, which they take from the body.

Detailed explanation-3: -Evaporation of sweat from the skin surface has a cooling effect due to the latent heat of evaporation of water. It absorbs the excess heat from our body and evaporates, thus we feel cool.

Detailed explanation-4: -Water is converted from its liquid form to steam when the heat of vaporization is reached. Since sweat is made mostly of water, the evaporating water absorbs excess body heat, which is released into the atmosphere. This is known as evaporative cooling. Water has cohesive and adhesive properties.

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