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Cheetahs_never_win t1_j7fmnkj wrote

Well, gas has a hard time sitting still to "conduct" heat - convection and advection is inevitable.

And you have to be additionally precise in your setup.

More pressure means more gas matter or less gas volume, or somewhere in between.

But take it to its logical extremes: Almost 0 matter means a vacuum and not heat transfer from "conduction," and infinite pressure means infinite matter needs to be heated up, thus no "conduction."

But if convection is permitted, then generally higher pressure makes it easier to transfer heat between molecules

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Cheetahs_never_win t1_j7fn88r wrote

And an extra note to point out that gas cannot actually possess either. 0 pressure means no gas and gases tend to become liquid under sufficient pressure, and in the scenario of gas in the sun, something much more interesting happens.

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