Anyone who uses glasses, cameras or simply the bathroom mirror has experienced the phenomenon of fogging when the temperature decreases or the moisture level abruptly increases. This phenomenon can be explained by the condensation of too high a level of moisture for the relative temperature level of the involved device. Any light which is transmitted in a foggy atmosphere is scattered by the water droplets in the air, causing the view to become fuzzy.
The same phenomenon is also responsible for the formation of fog on greenhouse walls, vegetable packaging and so on. Various additives are available to minimize or, in the best cases, suppress fogging and the adverse effects that are a consequence of it.
The condensation of air moisture on the cold plastic, causing the formation of tiny droplets on the surface, as well as light scattering and obscuring of the polymer surface. This is a significant problem for optical applications, packaging, horticulture, etc ... For a given difference of temperatures between the air and the plastic part, the duration of the fogging depends on the thermal conductivity of the polymer.