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Worldbuilding

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    $\begingroup$ This might be a case of falling in love with the word more than what it actually is. Supercritical CO2 sounds cool (at least to people that are into world building), but at the end of the day, it's just a very nice word for a rather boring thing. What do you hope to get with those oceans? What do you want to do in your world? Maybe there is a good way to get there other than CO2 $\endgroup$
    – Raditz_35
    Commented Nov 16, 2019 at 15:40
  • $\begingroup$ @Raditz_35 My setting is a hard-scifi one. I'm just interested in exploring some more exotic (read not found in the solar system) planets in order to figure out how I could use them in stories later. If this planet is rather mundane, exept for having extreme pressures and temperatures, and looks pretty much like Earth I'm fine with that. $\endgroup$
    – TheDyingOfLight
    Commented Nov 16, 2019 at 15:52
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    $\begingroup$ It's probably worth considering that there are various supercritical liquid–gas boundaries, so it would depend on where your supercritical fluid is with respect to those. $\endgroup$
    – user66717
    Commented Nov 16, 2019 at 17:07
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    $\begingroup$ Supercritical fluids are not liquids. Think of a supercritical fluid as a gas with the density of a liquid, or as a liquid with the expandability of a gas. That is, supercritical fluids are dense like liquids; but, like gases, they expand to fill the available volume: a supercritical fluid won't show a well-defined surface the way a liquid does. (And you may want to revisit the title of the question: supercritical CO2 is a fluid; you maybe wanted to say liquid-like; not that it would make any sense.) $\endgroup$
    – AlexP
    Commented Nov 16, 2019 at 17:17
  • $\begingroup$ What should "look like" or "behave" even mean? Your question (and all the other questions recently here about other molecular oceans) are ill-defined. Hard science can address numbers and not vague concepts. You can ask "How much $CO$ and $H_2O$ would I need to form a $CO_2$ ocean?" or "Under which conditions would $CO_2$ rain out?", but your question as it stands doesn't mean much. $\endgroup$
    – AtmosphericPrisonEscape
    Commented Nov 16, 2019 at 21:18