To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

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Solution

The breath that we exhale contains water vapour. When the warm, moist exhaled air comes in contact with the colder glass surface, it condenses. This makes the glasses wet and makes it easy to clean.

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To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

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To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Q. To clean their spectals people often breathe out on glasses to make them wet explain why the glass became Wet ?

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.