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: When viewed under a [[microscope]] small [[object]s like a [[pollen]] grain or tea leaf seem to change direction randomly.
: [[Brownian Motion]] can be [[explain]]ed if the small [[object]]s are being hit by other, even smaller [[object]]s that cannot be seen. This is [[evidence]] that [[matter]] is made of [[particle]]s.
{| class="wikitable"
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|[[File:BrownianMotion.gif|center]]
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| style="height:20px; width:200px; text-align:center;" |
In this animation the grey [[particle]]s represent [[particle]]s too small to see. The yellow [[particle]]s represent [[particle]]s that are big enough to see and the blue lines show the random path of the yellow [[particle]]s.
|}