An example of a teaching analogy:
"According to Graham's Law, the velocity or rate of diffusion of a gas is inversely related to the square root of the molecular mass. Thus, molecules of small mass travel more rapidly and molecules of larger mass travel more slowly. This idea can be easily remembered by considering the following analogy:
Consider 10 runners who were so closely matched that they had essentially equal times for running a 1000 metre race. Now suppose half of the runners were required to carry an extra 10 kg mass that was attached to them by a belt or backpack. Likely the 5 who had to carry the extra mass would now lag behind the rest of the runners."
Previously posted at scienceanalogies.com by retired science teacher Murray Hart – original source: Based on Toon, E.R. and Ellis, G.L. Foundations of Chemistry New York: Holt, Rinehart and Winston, 1973 p. 136
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