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Small microscopic visible particles move randomly around in water.
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If water were continuous, this shouldn't happen.
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The amount it moves also quantitatively matches with the expected properties of water.
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Tiny uniform plastic beads called "microbeads" are the preferred 2019 modern method of doing this: https://en.wikipedia.org/wiki/Microbead
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Original observation in 1827 by Brown, with further experiments and interpretation in 1908 by Perrin.
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Video 143. "Observing Brownian motion of micro beads" by Forrest Charnock (2016) Source.
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Ancestors

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