Why does a partially-full waterbottle start fogging up inside when left undisturbed for long enough- but only on the side furthest from the nearest window?
In: Physics
The side of the water bottle facing the window is kept at the temperature of the window. The side facing the room, however, can change to match the temperature of the room. If the room has warm, moist air, one of the ways the water bottle can gain heat is by the condensation of that moisture. When the water condenses onto the bottle, it gives some energy to the water in the bottle, warming it up and making it more similar to the air of the room.
The side of the bottle that faces the window also doesn’t get as much air flow, so new moist air can’t get to it as easily, making it harder for water to condense onto the surface.
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