There is no "surface" as such. IIRC it's defined to be where the atmos pressure has some specific value, have to look up what value.
What is meaningless about that, other than that they'd immediately sink?
Meaningless in that there isn't a well defined surface that you could stand on, until of course you'd sunk to the solid core.
you might sorta float tho
Once the atmos is about as dense as water, you prolly would. Not sure I'd fancy the pressure, tho.
But would you even do that, bearing in mind the density of liquid hydrogen is only 0.071 g/cc? Wiki says gas giants "are thought to consist of an outer layer of molecular hydrogen surrounding a layer of liquid metallic hydrogen, with probably a molten rocky core".
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