Consider the following statements. When water changes phase from liquid to vapour, it absorbs heat from the surface on which it lies. The lower the relative humidity of air, the more it is filled with moisture. When sweat evaporates from the human body, it absorbs heat from the skin and thereby cooling it.How many of the above statements is/are correct?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'B'. Can you explain this answer?

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UPSC Exam > UPSC Questions > Consider the following statements. When water...

Consider the following statements.

When water changes phase from liquid to vapour, it absorbs heat from the surface on which it lies.
The lower the relative humidity of air, the more it is filled with moisture.
When sweat evaporates from the human body, it absorbs heat from the skin and thereby cooling it.

How many of the above statements is/are correct?

a)
Only one
b)
Only two
c)
All three
d)
None

Correct answer is option 'B'. Can you explain this answer?

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Consider the following statements. When water changes phase from liqui...

Statement 2 is incorrect.

On a hot day, our body uses sweat to cool itself. Sweat is released via our skin to the surface. There, the liquid evaporates. When water changes phase from liquid to vapour, it absorbs heat from the surface on which it lies. So when sweat evaporates, it absorbs heat from the skin, cooling it.
The higher the relative humidity of air, the more it is filled with moisture. When air already contains a lot of moisture, it won’t easily accept more. This means that the sweat on your skin can’t evaporate. At the same time, the body keeps sweating because it is still expecting to cool itself.
As a result, if the relative humidity is high, you can sweat on a hot day even when you are sitting still – while your body also keeps accumulating heat. This can quickly become dangerous.
A relative humidity of 30-60% is generally considered to be comfortable. Environments that have lower levels than this typically use humidifiers to increase the humidity. When the level is higher, a fan will help move the air around you and help sweat evaporate better.
In both cases, drinking water is important.

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Consider the following statements. When water changes phase from liquid to vapour, it absorbs heat from the surface on which it lies. The lower the relative humidity of air, the more it is filled with moisture. When sweat evaporates from the human body, it absorbs heat from the skin and thereby cooling it.How many of the above statements is/are correct?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'B'. Can you explain this answer?

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