How does Boyle's Law apply to our breathing process?

Since this is not my area of expertise, I searched Google under the key words "'Boyle's law' breathing" to get these possible sources:

http://library.thinkquest.org/12596/bonus_boyles.html
http://www.voicetuition.co.uk/boyleslaw.htm
http://www.doalasvegas.com/html/boyle_s_law.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.