This evening after a walk in the cold weather, about -5 degree Celsius, my glasses were misting up when I got back into the warm house, about +20 degree Celsius.
However, shortly after I went outside in the cold again, and the mist on my glasses disappeared. This puzzles me, since I guess the outside air to have nearly 100% relative humidity, since it is cooling down in the evening.
How come that the mist on my glasses can disappear in the freezing weather?