The following you tube clip is a pretty good teaching resource. Personally, I have never been a big fan of this type of you tube clip but it is made by students and I would imagine that students around the world would find it useful as it helps visualise different components of the ideal gas equation.
I would probably use it as an introduction before spending more time explaining the different parts of the equation in more detail.
Enjoy!
[youtube]NFqiFv6rVbA[/youtube]