[reg45]

hydrogen slush fuel

If liquid hydrogen is further cooled (almost to the solidification point) it would form a slush. You wouldn't want to cool it any further otherwise you would have solid hydrogen - that stuff would be hard to pump.

[LS]

Right. That is what I said, wasn't it? When I said "frozen," I meant like a slurpee is "frozen," but not, obviously, solid ice.