To cleantheir spectacles, people often breathe out on glasses to make themwet. Explain why the glasses become wet.

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Solution

Duringexhalation (or breathing out), carbondioxide is released along with water vapours. If one breathes outonto glass, the released water vapours collide with the surface ofthe glass, thereby making it cooler. As a result, the water vapourspresent in the air surrounding the glass condense and get attached tothe glass surface. Consequently, the glass becomes wet.

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Give reasons for the following. [5 MARKS]
a) People often breathe out on the glasses of their spectacles for cleaning.
b) A bottle of cold water kept outside refrigerator, shows puddle of water around it.
c) Fog is seen in cold winter mornings.

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