Click here to visit Main Content
TGH1: Condensation
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.

Return to main content
main content h1.1

more info
tgh1: notes
tgh2: notes
tgh3: notes

more info
  < prev | next >  
  user guide