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Question

Blowing air onto a mirror makes it _______.

A
clean
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B
hazy
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C
cold
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D
sticky
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Solution

The correct option is B hazy
A mirror or a glass is at a lower temperature than the air that comes of our mouth, i.e. the air we blew is hotter than the mirror. So, when we blew (hotter) air onto a (colder) mirror, the air starts to cool down on the mirror's surface. Hence, it creates a foggy substance which makes the mirror look hazy.

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