(11-12-2015, 05:19 PM)eseedhouse Wrote: To a pretty fair approximation 10cm of water is about 1% of normal sea level ambient atmospheric pressure. Even the max most machines can deliver is about 2% of standard pressure. It's the difference between what the machine provides and the outside pressure that causes your breathing passages to open wider
So if the ambient pressure at your bedside is 1000 millibars then the machine at 10 cm of water will deliver about 1010 millibars to your nose throat and lungs. This is only an approximation, but it's a pretty good one. A really bad storm at sea level may drop the ambient pressure to around 980 millibars, and of course if you live on the hights it will be lower too.
Well . . . interesting. It just seems like when I open my mouth and let my machine blow (which will auto adjust up to 18cm) it seems like a giant WHOOOOSH of air coming out, not like what you'd get from a 1.8% change in pressure. But maybe that's just the way it is. Surprising, though.