This is a general question that has come to my mind as I try to understand the economics of LOX. Hospitals have O2 available in almost every room in their buildings. Do they generate this O2? Does it come from some super concentrator located in the basement or is it liquid that they purchase and store or is it delivered to them in giant industrial e-tanks or what?
It is just one small piece of the puzzle I am trying to understand with regard to the shrinking availability of LOX to oxygen dependent people.
Thanks