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



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