Big Idea: All matter is made of small particles and this can explain many of its properties. More info...
Demonstration
Practical Activity 14-16
Class practical: As with a spring, force is required to compress or to expand a gas.
Demonstration: This experiment is quite elaborate, but it yields quantitative results. A beam balance weighs the pressure.
Demonstration: This is a larger, more dramatic version of the practical, Pressure exerted by a stream of balls.
Class practical
The atoms or molecules in a gas are widely separated from one another and interact only when they collide. Each one changes...
Teaching Guidance 14-16
Statistical studies, combined with the assumption that every molecular collision is elastic, lead to the conclusion that all...
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