Why there are small water droplets in iced drinks at room temperature is explained by chemical knowledge.

This is a process of physical change, but it is a very interesting phenomenon because it involves several daily phenomena.

Dew in autumn, when the weather is cold, the water vapor in the air will condense into dew. There is a technical term here called dew point.

Another phenomenon is related to the process of heat conduction. Usually, heat is transferred from high temperature to low temperature, which is a spontaneous process. If you want reverse conduction, you need to do work (air conditioning principle). You feel cold with a drink bottle because the heat of your hand is transferred to the drink, and the temperature of your hand is reduced. The temperature-sensitive nerve detects it and tells you to be cold.

Take out the iced drink and leave it at room temperature. Cold drinks should be heated by absorbing heat from the surrounding air. The air near the beverage bottle will be cooled. When the humidity in the air is suitable enough, when the temperature drops to a certain temperature, it will reach the dew point (that is, at this temperature, the water vapor in the area will reach saturation), and when the temperature drops again, water droplets will condense out of the beverage bottle.