The particle sandbox model allowed us to create simple gas molecules and place them inside containers. However, it did not allow us to see how the particles behaved. We can use computer models to animate the particles, too.

Below is another simple modeling toolkit that allows us to define the behavior of gas particles. For simplicity, this toolkit allows you to work only up to 4 particles. The short video on the right demonstrates how to use the blocks below the model to program the behavior of the particles. Please watch it carefully if you are having difficulty with the blocks.

A few quick points:

• Click  to reset the model and click  to run your model.
• Your code should always start with the  block, or the model will not know what to do.
• Your code will be performed by the particles continuously.
  • For example, if you wrote that "each particle + moves zig-zag", each particle in the model will move one step forward doing a zig-zag movement and then move one more step forward the same way, and so on. This will keep going on as long as the GO button is pressed.

Now let's try to figure out how gas behave inside a container!

Please do not spend more than 6 minutes on this task.