[Ellen]

Ten Hammers, long time since I studied physics but as I recall, Boyle's Law(s) which cover the behavior of gasses show that volume is inversely related to pressure; i.e. pressure goes up, volume goes down. A practical example of this is a coal forge blower which moves a larger volume of air at a low pressure and works well, vs. trying to manage a coal fire with an air compressor which produces a higher pressure and a lower volume. Sorry if my explanation is not clear, perhaps others can be more lucid on the topic.