Biology * » Moisture *
It is a well-known fact that moisture condenses on the surface of certain objects in cold temperature. When an object is surrounded by cold air or other cold matter, the atomic nuclei on the object surface do not release enough energy for the surface to be able to push the water molecules away. This causes the three-dimensionally expanding water molecules to push each other towards the surface of the object, for example, spectacles, and the humidity thus condenses on the surface of the lenses.
In warmer air, in contrast, enough energy is aimed at the object from the outside to cause a sufficient amount of energy to be released from the object itself to prevent the humidity in the air from condensing on the surface.
Of course, energy flows towards the object surface through the space between the expanding atomic nuclei of the object. That is to say, objects do not radiate energy by themselves and away from them, but from the nuclei of the atoms on the object surface.