Why the glass get frosty?

Glass gets frosty due to the condensation of moisture on its surface, often resulting from a temperature difference between the glass and the surrounding air. When warm, humid air comes into contact with the cooler glass, the moisture in the air condenses into tiny water droplets, creating a foggy appearance. Frost can also form when the temperature drops below freezing, causing water vapor to crystallize on the glass. This effect is commonly observed on Windows and glasses in cold weather or when warm drinks are placed in cold containers.