Thanks for such a detailed response, but I confess I do already understand the principle! I was actually just idly wondering what the delta on air+water pressure vs water or air only would be and how to calculate what diameters/speeds would be necessary to achieve certain heights/output.
I may have been tempted to build a mini version for the completely unnecessary reason of automating my plant watering with a spare tiny 3V solar panel that may no longer even work and some other trash. Just ADHD things.