What is Brownian motion? Discuss Perrin's method for determination of Avogadro number in Brownian motion. How can this method be used to estimate the mass of molecule

Brownian motion refers to the random, erratic movement of microscopic particles suspended in a fluid (liquid or gas) due to collisions with the molecules of the surrounding medium. This phenomenon was first observed by Robert Brown in 1827 and is a result of the constant bombardment of particles by fluid molecules. The irregular movement is a direct consequence of the thermal motion of the fluid's molecules.

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