Home Lesson for Students
   
When you roll one ball into another ball that is sitting still, the ball that was originally still will start rolling - but the other ball will slow down.  We can think of  a hot gas as many tiny balls, moving very quickly and a cool gas as many tiny balls, moving very slowly.   This way of thinking about gasses is often called the "Billiard Ball Model" of gas.

 

What would happen if you mixed a hot gas and a cool gas together?  Try to explain your answer using the Billiard Ball Model.

 

What would happen if you mixed a hot gas with twice as much cool gas?  Try to explain your answer using the Billiard Ball Model.

 

Before going on to the next page - write down what you think happens when you mix a hot gas with a cool gas, then go on to Activity 5 (outside site) to watch an animation of gasses mixing.