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TGN2:
Crystals
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LINKS |
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Notes on video of sulfur freezing
Students should notice tiny crystals forming around the edge
of the liquid inside the paper cone.
They should also notice that the crystals produced in the
first cone are long and thin.
By contrast, the sample from the second cone seems to be just
a lump, with no visible crystals: the sample is
made of lots of interlocking crystals, but it is just not
possible to see them.
Notes on video of ice freezing
Crystals form around the edge first.
The crystals are long and thin (and are growing towards the
centre).
When the water in the cup is allowed to freeze completely,
the crystals grow into each other to form a solid block.
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Science Enhancement Programme CD-ROM 2005 |
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user
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