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TGH1:
Condensation
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Notes on the image of water particles and air particles
Use this as a quick exercise to remind students about particle
energies and particle collisions before going on to the questions
which follow. Draw students’ attention to the fact that
the water particles in the image are still separate: it is
important for students to realise that water is in the air
but it is not in the liquid state. If you are doing this on
an interactive whiteboard it is especially easy to cross off
each coloured shape systematically to build up a quick table
of energy distributions. (There are 13 water particles, of
which 2 have high energy, 5 medium energy, 6 low energy; there
are 35 air particles, of which 10 have high energy, 12 medium
energy and 13 low energy). Notice that the distributions do
not match exactly: in such a small sample you would not expect
them to, but when there are huge numbers of particles the
energy distributions would correspond more closely. The important
point to establish is that, although all the water
particles would initially have had high energies, after many
collisions relatively few have high energy, and many have
relatively low energy.
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Science Enhancement Programme CD-ROM 2005 |
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user
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