The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that

Correct Answer: Water vapour in the air around the bottle loses energy to the bottle

Explanation:

• When the milk bottle is taken out of the refrigerator, its surface is cold.
• The air around the bottle contains water vapour. When this vapour comes in contact with the cold surface, it loses energy (heat) to the bottle.
• As a result, the water vapour condenses into tiny droplets of liquid water, which we observe on the outside of the bottle.

This process is called condensation. It is not because the milk itself loses heat, but because the water vapour in the air cools down when it touches the cold bottle surface.