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  1. Oxford American Dictionary

    critical point

    • IPA[ˈkridəkəl point]
    • n.
      a point on a phase diagram at which both the liquid and gas phases of a substance have the same density, and are therefore indistinguishable.；a point on a curve where the gradient is zero.

    • noun: critical point, plural noun: critical points

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    critical point

    • n.
      a point on a phase diagram at which both the liquid and gas phases of a substance have the same ...

    Oxford Dictionary