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

The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the water vapor in the air around the bottle loses some of its energy to the bottle. When the temperature of the milk drops as it loses heat into the surroundings, the air around the bottle cools down as well. The water vapor in the air then loses some of its energy and condenses into liquid droplets on the surface of the bottle. This is called condensation, and it occurs when the temperature of the air is lowered to the point where the water vapor in it can no longer remain in its gaseous state.