why does a person blow on her/his spectales to wipe them clean
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Answer:
See your breath contains vapours and carbon dioxide.When these vapours hit the cool glass surface of your spectacles,the hot vapours due to containment of carbon dioxide,IIT condenses on the surface and helps in cleaning.
Explanation:
Im,Sorry if it is wrong but it is my theory
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Answer:
The air blow from the mouth is hot and contains moisture. when the moisture touches the glass surface, it turns into fine water droplets. These water droplets help to clean the spectacles
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