A lecture presented to the Scholars of the 1999 Professor Harry Messel International Science School at the University of Sydney, Australia.
Presented by Stuart Prescott, Key Centre for Polymer Colloids, University of Sydney, Australia.
The Scholars of the Science School are final year Secondary School students with an interest in science.
This lecture is part of the supplementary material for an article by Stuart W Prescott, James McDonald, Christopher M Fellows, Robert G Gilbert in the Journal of Chemical Education.
This lecture may be used in part or in its entirety provided due recognition to the Journal of Chemical Education and the authors is given.