This JAVA applet performs a computer simulation of the possible model of a gas-filled container discussed in this module. As the applet runs, molecules inside the container move around. Each time a molecule hits the wall of the container and bounces off, the length of purple bar at the right of the display indicates how hard it hit the wall. The strength with which the molecule hits the wall depends on its speed and the angle at which it hits the wall -- molecules hitting the wall head on at a right angle hit harder than those hitting the wall with a "glancing blow." At the same time that the purple bar indicates the strength of the hit, the count is incremented by one. The count display indicates how many molecules have hit the wall. You can run this simulation with your choice of three possible radii for the container -- 1 unit, 2 units, and 4 units. You can also choose from two speeds for the molecules -- 1 unit and 2 units. Click in one of the six labeled boxes to run an experiment with the indicated radius and speed. Run several experiments to see how the size of the container and the speed of the molecules affects the number of hits and their strength. All the experiments run for the same simulated length of time. Because this is a random simulation the results will vary somewhat if you duplicate the same experiment.