Question

Q. 16 Comment on the following giving reasons:
(a) Why is water used as a radiator in motor car radiators?
(b) Why do wet clothes dry quickly on a windy day?
(c) Why is wet bandage placed on forehead of a person suffering from high fever?
(d) Why is it important to know melting point of a substance?
(e) Why is no dew formed on a windy day or when sky is cloudy?
(1) Why does a cooler cool better on a dry day?
(g) A gas fills completely the vessel in which it is kepł.

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Answer 1

Ethelene glycol. Since pure ethylene glycol has a higher boiling than water, a solution of ethylene glycol in water has a higher boiling point than pure water. The freezing point of a water solution is lower than that of pure water. Thus, the solution prevents freezing of the coolant, and can get hotter without boiling.

Answer 2

Answer:

(a). to make cool the machine of motor car.

(b). because in windy days rate of evaporation is increases

(c). because water,less the body temperature.

(d). to melt the substance easily.

(e).because dew has tendency to vaporize in these days

(f).because in dry days rate of evaporation increases.

(g).becausa has less intermolecular force of attraction.