Nice post Relmuis. However, I'm not sure that it is relevant to the question that was asked. Phase diagrams like you mentioned are for conditions that are, at least, somewhat near what we call "normal". Conditions deep in a gas giant planet are far outside of the area where those diagrams apply. The pressure deep inside Jupiter is in the gigabar range!

From the Nine Planets website:

"Recent experiments have shown that hydrogen does not change phase suddenly. Therefore the interiors of the jovian planets probably have indistinct boundaries between their various interior layers."

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