⚛️ Brownian Motion
Brownian motion is the ceaseless, erratic movement of microscopic particles suspended in a fluid, caused by countless random collisions with surrounding molecules. Einstein showed in 1905 that the mean squared displacement grows linearly with time, ⟨x²⟩ = 2Dt, giving early direct evidence for the atomic theory of matter.
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For a fuller technical treatment, see the Numerical Methods Glossary — ODE Integration reference on MySimulator.
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