Diffusion

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Diffusion

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In an atmosphere, or in any gaseous system, the exchange of fluid parcels between regions, in apparently random motions of a scale too small to be treated by the equations of motion. </dd>
2. In materials, the movement of atoms of one material into the crystal lattice of an adjoining material, e.g.,penetration of the atoms in a ceramic coating into the lattice of the protected metal. </dd>
3. In ion engines, the migration of neutral atoms through a porous structure incident to ionization at the emitting surface. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use