random motion of gas particles results in diffusion.
brownian motion mathematical model used describe random movement of particles suspended in fluid. gas particle animation, using pink , green particles, illustrates how behavior results in spreading out of gases (entropy). these events described particle theory.
since @ limit of (or beyond) current technology observe individual gas particles (atoms or molecules), theoretical calculations give suggestions how move, motion different brownian motion because brownian motion involves smooth drag due frictional force of many gas molecules, punctuated violent collisions of individual (or several) gas molecule(s) particle. particle (generally consisting of millions or billions of atoms) moves in jagged course, yet not jagged expected if individual gas molecule examined.
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