Forum:Chapters and Volumes

I was looking through volume pages, and I noticed though each volume shares the name with one of the chapters in it, sometimes the volume article will have a completely different name, for example chapter 1 and volume 1. I looked around for a policy that might explain why is that so, but I couldn't find it. Do we use these different names because that's the official English translation of the volume's name? Omnibender - Talk - Contributions 15:50, December 22, 2010 (UTC)