IGNOU BPHCT 135 2026 - What is Brownian motion? Write its two examples. Show that during sedi

Question

What is Brownian motion? Write its two examples. Show that during sedimentation, particles concentration decreases exponentially as height increases.

19 Jan 2026

Answer :

Word Count : 263

Brownian motion is the continuous, random, and irregular motion of microscopic particles suspended in a fluid, resulting from incessant and unequal collisions with the fast-moving molecules of the surrounding medium. This motion becomes more prominent for smaller particles and at higher temperatures and provides direct experimental evidence for the molecular nature of matter. The randomness of Brownian motion arises because molecular impacts on

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