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When a droplet of glycerine dissolves, repeated
collisions with the water particles make the
glycerine particles separate and become mixed
up with the water particles.
The animation represents a ‘time lapse’
sequence of snapshots, showing this
happening.
The glycerine is still ‘there’, but we
can’t see it because we can only see groups
containing large numbers of particles: we can’t
see individual particles.
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