Question

Why do we get dew on the surface of a cold soft drink bottle kept in open air?

(OR) 

Raju observed small droplets of water outside a cold soft drink bottle kept in open air. What is the reason for the formation of droplets?

Answer 1

1. When cold soft drink bottle is kept in open air, the temperature of surrounding air is higher than the temperature of cold drink bottle. 

2. Air contains molecules in the form of vapour. 

3. During the motion of water molecules in air strike the surface of cold drink bottle.

4. Then the molecules of air lose their kinetic energy which leads to lower the temperature and they convert into droplets. 

5. So dew is formed on the surface of cold soft drink bottle.