dllfo wrote:My wife asked me exactly what does cm H2o mean? Can we compare it to Pounds per Square Inch (PSI) ?
I can read the words, but do not work with any other systems using it, so it is some nebulious term tossed out by an engineer with a propensity for accuracy.
It is a "relative term" to me, meaning...20 cm H2o is more than 10 cm H2o.
BUT is the scale linear or logarithmic?
Does 20 cm H2o roughly equal 20 PSI?
For those whose minds are clear and functioning within warranty specs, does it really matter for most of us?
Should it be construed as a simple scale for our use, not of any real importance to us?
Sometimes I like to "just know" what something means. Is there a simple explanation? BTW, one word answers don't get credit on today's exam
That is all for today’s lesson on hydrostatic pressure ... tomorrow's lesson ... how to build a CPAP system with advice from your friendly cpaptalk members.
Sleepless in St. Louis wrote:That is all for today’s lesson on hydrostatic pressure ... tomorrow's lesson ... how to build a CPAP system with advice from your friendly cpaptalk members.
Correct me if you think I'm wrong, but you really could create your own basis cpap if you had time on your hands and the inclination. For a motor you'd use a vacuum cleaner motor. You'd needd any type of reastat to control the speed of the motor. A home made water column to measure and adjust the flow and some duct tape to attach to your interface hose. You'd need a few other assorted hoses and clamps, but you really could do it. You may not want to actually use what you built but it would be a fun project for the Mc Gyver types.
sinkem wrote:Just to put it in writing.
From HG45's web site: 20 CMH2O = .28 PSI
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