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this is the "microscopic" mechanism, on the scale of soil particles.
this is the "microscopic" mechanism, on the scale of soil particles.

==== khuyết tán ====diffusion is a fundamental physical phenomenon, which einstein characterized as brownian motion, that describes the random thermal movement of molecules and small particles in gases and liquids.
==== molecular diffusion ====diffusion is a fundamental physical phenomenon, which einstein characterized as brownian motion, that describes the random thermal movement of molecules and small particles in gases and liquids.

"search for massive particles produced in interactions at 30 bev", brookhaven national laboratory, columbia university, united states department of energy (through predecessor agency the atomic energy commission), (january 1965).
"search for massive particles produced in interactions at 30 bev", brookhaven national laboratory, columbia university, united states department of energy (through predecessor agency the atomic energy commission), (january 1965).