Question

why do people blow air on their spectacles before cleaning them

Answer 1

⏺Heya friend !

➡Here's your answer :-

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⚫During exhalation (or breathing out), carbon dioxide is released along with water vapours.
⚫  If one breathes out onto glass, the released water vapours collide with the surface of the glass, thereby making it cooler.
⚫ As a result, the water vapours present in the air surrounding the glass condense and get attached to the glass surface.
⚫ Consequently, the glass becomes wet.

⚫hence the glass can be wiped properly due to presence of water droplets.
⚫so , people blow air into their spectacles before cleaning them.

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I hope it helps u !!!!☺

Answer 2

Answer:

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.

Explanation:

Here is the correct and crisp answer