Question

We can notice a Puddle of water around a chilled water bottle when kept outside.Why?

Answer 1

it's because the surrounding air contains tiny droplets of water in the form of water vapour.so when these water vapours come in contact with chilled water bottle it condenses into water and form Puddle of water around the bottle.

Answer 2

It happens due to a phenomena called Condensation

Air contains moisture (water vapours) normally termed as 'humidity'. The warmer the air, the more water it can hold.

Now when you pour in chilled water, the surface temperature of the bottle decreases and it becomes cold. This 'cold' gets transferred to air surrounding the bottle, making the nearby air 'cooler'.

As the nearby air cools down, its ability to hold water decreases and that water gets surrounded around the water bottle in the form of droplets making the outside of your bottle (or steel jar) wet.

This process is similar to what causes clouds to form and rain to fall. Moisture in the air is condensed and precipitated because of cooler temperature and similar effects.

Hope this helps.