In 1827, a scientist called ____ Brown noticed that tiny ____ particles moved with a ____, random motion in ____. This type of movement of any particle ____ (‘floating’) within a liquid or gas is known as ____ motion. Large, ____ particles (e.g. smoke) can be moved with Brownian motion by smaller, ____ particles (e.g. air) travelling at high ____ — which is why ____ particles in air appear to move around randomly when you ____ them in the lab.

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