[duckymcduckface]

Where do hospitals get their O2 supply from out of curiosity? Do they buy it from one of the major gas suppliers like praxair or airliquide and store it in the back as GOX/LOX or can it also be produced on site?

[khwerou098]

In the past they had large tanks of liquid O2.

More recently, many have a large oxygen concentrator machine on site which just takes it from the air.