Big Idea: All matter is made of small particles and this can explain many of its properties. More info...
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.
The atoms or molecules in a gas are widely separated from one another and interact only when they collide. Each one changes...
Statistical studies, combined with the assumption that every molecular collision is elastic, lead to the conclusion that all...
Our first collection of videos gives teachers and coaches of physics a preview of the training we offer ahead of this term's live support sessions.