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

Open in App

Solution

During exhalation (or breathing out), carbon dioxide is released along with water vapours. If one breathes out onto glass, the released water vapours collide with the surface of the glass, thereby making it cooler. As a result, the water vapours present in the air surrounding the glass condense and get attached to the glass surface. Consequently, the glass becomes wet.

Suggest Corrections

Similar questions

Question 6

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

Q. To clean their spectacles, 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?

Join BYJU'S Learning Program