Question

"diffusion in solids rather than of solids is more likely"...what does this mean??

Answer 1

Diffusion in solids is likely because there is almost no water in the solid so the diffusion of fluids can be done easily as in Imbibation(which occurs in raisins,almonds,etc).
But the diffusion of solids into other bodies  is comparatively hard because solids resist to change their shape and also they dont diffuse as easily as fluids

Answer 2

Answer:

Diffusion is the movement of particles of different substances from the region of their high concentration to the region of their lower concentration. The diffusion of one substance into another substance goes on until a uniform mixture is formed.

Explanation:

It means diffusion IN SOLIDS is more likely as compared to diffusion OF solids.

Almonds, chickpeas, and other dried seeds are examples of solids that may easily imbibe water into their intramolecular spaces.

Consider mixing these seeds with icing sugar, something solid, or a very, very fine powder.

Does icing sugar, which has a fine texture by itself, or another powder infiltrate into seeds. Not quite, huh?

The reason being— “solids resist change in their shape”.

Therefore, as opposed to diffusion of solid, diffusion into solid (of a fluid) or in solid (diffusion of one solid into another solid—constituents in an alloy mingling with each other) is extremely common (into a fluid OR some other outer solid).

Alloys are examples of solids diffusing into other solids, for as copper in "copper alloy—brass" (mixture of copper and zinc).

Cause of diffusion "IN" solids: Unless the material is at absolute zero temperature (zero Kelvin), individual atoms continue vibrating and eventually migrate within the material. This is known as thermally-activated random motion of atoms, which is also the source of Brownian motion.

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