I'm trying to help my middle school son find source materials for a science project. The experiment involves measuring the boiling point of water at different altitudes. I've taken him to the library, etc., and have come up blank. It's almost like we don't know enough about science to use the right search terms...water vapor, boiling point... Nothing. Are there some magic words to use? Is this in a specific area of science? Is there some other way to narrow this down? (I know the scientific answer to the experiment, the goal is to get reference materials for the kid so he can learn it himself).