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

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Solution

To breathe out gases contain in water-vapour. The water-vapour condenses at spectacles so glass becomes wet and with the help of small amount of water, it is easy to clean the spectacles.

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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.

Measure your chest

– Take a deep breath in

– Ask your friend to measure your chest with a thread.

Measurement____________

– Now breathe out. Again ask your friend to measure your chest. Measurement____________

– Was there any difference in the two measurements of your chest?

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