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Notes on video on A1.1 and animation on A1.2 |
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LINKS |
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Notes
on the video of wax melting
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There is no temperature reading
in this video for a reason. Students should be concentrating
on observable changes in the beaker at this stage. |
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Students may notice that the
solid wax sinks in the liquid wax. This is very different
behaviour from water, although on the video the liquid
wax may look like water. |
Notes on the animation of wax melting
This is shown as an animation because it would be very difficult
to ensure that the points could be made clearly
using video.
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The melting point of this candle
wax is 64ºC. It is important for students
to realise that the lump will only melt when it is hot
enough. Some students may expect some wax to
melt at 63°C: a piece of wax heated to 63ºC
will not melt no matter how long it is kept at that
temperature. Not even a little bit of it will melt until
the temperature reaches 64ºC. |
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The animation stops
at the point where all the wax has melted. |
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| a
Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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