Subject: Boyle's Law and how to demonstrate it

I'm having a hard time finding a better way to demonstrate the principal 
of Boyle's Law. I thought about taking a balloon down under water and 
taking it up in an airplane to show how pressure affects volume. But that 
isn't a real good way for us because we can't scuba dive deep enough, 
especially in the winter time, or we don't have an airplane. Could you 
tell me about a book that would have different ways to present this law or 
make a suggestion about what I might do instead of an airplane or a scuba 
dive? Thank you.

Re: Boyle's Law and how to demonstrate it