Thermodynamics Subject Matter
The air surrounding us contains water vapor in it. The amount of water vapor present in dry gas is referred as humidity. When a cold bottle comes in contact with the atmosphere we can see the formation of water droplets on the surface of the bottles. It is due to the condensation of water vapor present in the air.
The condensation happens because the water vapor which is relatively at higher temperature (Dry Bulb Temperature) attains its Dew Point (temperature at which vapor condenses at prevailing pressure) as it comes into contact with the cold bottle. As the temperature is declining from Dry Bulb Temperature to Dew Point the amount of vapor present in air starts decreasing by the condensation process and wets the outer surface of the cold bottle.
I think the answer given is talking about a cold glass on a hot day, but this question is the opposite and doesn’t make much sense.
Hey @Clayton_Haight, good catch! The question title has been fixed.