Question

Why do people blow air on there spectacles before cleaning them

Answer 1

People often blow out air onto the glass of spectacles before cleaning it. This is because, warm air when touches the cold glass surface, turns into small droplets of water. This moisture helps in cleaning the glass.  

Explanation:

• Air exhaled from our body has a high temperature equivalent to our body temperature of about 37˚C.  

• The room temperature is usually around 25˚C or even lower during the winters.  

• This warm air condenses on the cold surface and result in water droplet formation.

Answer 2

Explanation:

• 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. During our exhalation carbon di-oxide is released with the water vapors. This water vapors collide with the glass of the spectacle to create small droplets of water.

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