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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`State.critical_point_pure` returns a Python list containing FeOs `State`","articleBody":"When I call `State.critical_point_pure`, instead of returning a FeOs `State` as indicated in the docs, it returns an Python list whose only element is the expected `State`.\n\nExample code:\n```\ncp = State.critical_point_pure(pcsaft_pure[1])\nprint(f\"Return ({cp}) is of type {type(cp)}\")\nprint(f\"Element ({cp[0]}) is of type {type(cp[0])}\")\n```\nOutput:\n```\nReturn ([T = 309.00922 K, ρ = 6.41105 kmol/m³]) is of type \u003cclass 'list'\u003e\nElement (T = 309.00922 K, ρ = 6.41105 kmol/m³) is of type \u003cclass 'builtins.State'\u003e\n```\n\nNot a huge issue, of course, but I imagine it would be good to have the return type of `critical_point_pure` to match the binary and general counterparts (or to update the documentation).\n\n---\nI am using `feos` v0.8.0 and `si-units` v0.11.0 with Python v3.11.3.","author":{"url":"https://github.com/ImagineBaggins","@type":"Person","name":"ImagineBaggins"},"datePublished":"2025-08-29T21:06:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/296/feos/issues/296"}