Question

to clean there spectacles people often breathe out on the glass to make them wet? explain why the glass become wet

Answer 1

When we blow out air on spectacles the hot air from our mouth condenses and get converted in tiny water droplets and glasses become wet.
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Answer 2

the gases that we breath out contain water vapour which condenses at spectacles and glass becomes wet and with the help of small amount of water it is easy to clean the spectacles