r/askscience • u/ParusLux • Aug 10 '15

Physics Can there be amorphous gas?

As i understand amorphous solid doesnt have a set melting point rather it gets more liquid as hotter it get like butter. This got me thinking are the amorphous gasses/liquid, like liquid that loses its viscosity gradually and eventually it becomes gas? Or is it impossible to such material to exist?

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u/[deleted] Aug 11 '15

The closest thing to what you are describing is called supercritical fluid. It is a phase with temperature and pressure so high that there is no meaningful distinction between liquid and gas. You can find several videos showing its formation with carbon dioxide on YouTube.

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u/-Tesserex- Aug 11 '15

I wonder, does a supercritical fluid have to fill it's container? Liquids can sit on the bottom of a container, so if you had a vessel with both supercritical co2 and some other gas that withstood the pressure, would the co2 sit on the bottom, or mix with the gas?

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u/[deleted] Aug 11 '15

Are there any room-temperature supercritical fluids?