when people blow air into thier spectacles to clean and wipe how do the air help to clean the spectacles
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How does the air from the mouth help in cleaning the spectacles? Answer: The air blown from the mouth is hot and the glass of the spectacles is comparatively colder. The hot air we breathe out contains water vapours which turns into tiny droplets of water when it comes in contact with the colder glass.
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People often blow out air on their spectacles before cleaning them because they blow hot air from the mouth and the hot air in contact with cooling surface that is eye glass converted to the small droplets of water. This water helps to clean the glasses of the spectacles.
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