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

 

Answer:

The air we blow out contains water vapour. 

The water vapour condenses on the spectacles forming moisture and the glass is covered with a layer of tiny water droplets. With the addition of a small amount of water, we can easily clean the spectacles.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo