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TGC1:
The gas state
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Notes on the animation.
Students find gases mysterious, and have no real sense of
what a ‘gas’ might be. The intention here is to
introduce
the possibility of a gas state, in which the particles have
sufficient energy to overcome the hold which has been
keeping them all close together, as an extension of the particle
theory ideas which students have already
encountered. You could introduce this animation as part of
a ‘thought’ experiment’, asking students
to speculate
before showing the animation and introducing the idea of ‘the
gas state’. This then raises the question of what a
substance would be like in the gas state – what would
we observe – and leads on to the experiment shown in
the
next video.
You can find out more about research into students’
understanding and how Stuff &
Substance addresses the
Issues in the section on 'Features
of Students' Understanding' in the Teachers’ Guide.
Notes on the video
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Students need to
understand that the hot syringe does not contain anything
before the water is injected, and that at the end of
the video there is still no air in the syringe, only
water. This is important because students may find it
difficult to accept that the only particles in the syringe
are water particles unless this is established. |
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Students should
notice that the syringe plunger moves, even though they
cannot see anything pushing it, so whatever is in there
takes up a lot of space. |
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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