Why is a water bottle wet outside when it has cold water?

1. Water vapour is present in the air Unless you live in a place with 0% relative humidity (watch the weather news), water vapour is always present around you. 2. Cooling the water vapour gives us water droplets Its basic science really. read more

The cold water makes the bottle surface cool enough for the water vapour in the air around it liquify and form droplets on the bottle. Voila! You have your wet cold water-filled bottle. read more

As the air passes the water bottle it cools down a bit( due to heat exchange) and cooler the air less capable it is to hold water molecules. As a result of this water from air gets condensed outside the bottle making it wet. read more