Quote Originally Posted by satorian View Post
I was thinking about a way to do this. Well, sort of. Infinite compression sounds... difficult. But very high compressions could be reached by having a decanter of endless water empty into a riverine reservoir with a pinprick exit leading to a parabolic guiding jet.

We'd need a way to keep the decanter attached, so it doesn't just get blown off the apparatus by the water pressure.

We also need to make sure the very high pressures don't destroy the decanter from the outside (assuming magic prevents pressure of any degree from backwashing into the decanter and destroying it from the inside).

So a single riverine apparatus, formed around a decanter with a perfect seal so the water can't work its way between the decanter and the riverine. Past the outspout of the decanter, the riverine is shaped in a large globe reservoir, with the pinprick jet on the opposite vertex from the decanter.

As with all the Force magic solutions, it has the Dispel Magic weakness, but still pretty solid.
Spoiler: 2013 sketch I did of this
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The walls of fire to make steam are basically pointless, it was to make steam but all you need is for the exhaust port to let out less water then the input and it will eventually get up to speed.