A wet handkerchief is placed on the forehead of a person suffering from high fever. Why? Why is alcohol preferred over water? [3 MARKS]

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Solution

Reason out: 2 Marks
Explanation: 1 Mark

When a person has fever, his body temperature becomes more than the normal body temperature. If we put the wet stripe of cloth on his forehead, the water evaporates and absorbs the heat from his body, that causes cooling and lowers his body temperature. That is why doctors advise us to put wet stripes on the forehead of a person having a high fever.
Alcohol or shaving lotion is preferred over water because its latent heat of vaporization is lower than that of water.

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