What are materials required to diffussion of two gasses?
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Answer:
Diffusion, that is, the motion of one atom relative to other atoms, plays an important, yes, a vital role in many processes important to glass science and glass technology. To indicate a few, one might first mention that the process of glass making itself, in every case except for that of a single component glass like silica, involves diffusion, as glasses typically originate as discrete particles of material of chemical compositions quite different from that of the ultimate glass. Thus, the motion of the atoms from a grain of silica, say relative to those of a grain of limestone, is necessary to produce the homogeneous product we require for modern glass. At the same time, diffusion processes participate in the development of cords during the glass making process, as it requires diffusion for material from refractories to become imperfectly dissolved in glass, and it also requires diffusion within the glass melt for composition variations to develope near the surface of the melt due to selective evaporation of one or more species. Otherwise, the region where the composition was depleted in the evaporating species would be confined to a single molecular layer, or two.