Discussion
Which point in the phase diagram best represents supercritical condition ?
Answer: B
The point representing the supercritical condition is B.
On a pressure-temperature phase diagram, the liquid-vapour boundary rises from the triple point and ends at the critical point. Beyond that point, at temperatures and pressures above the critical values, there is no distinction between liquid and gas: the substance is a supercritical fluid. Point B lies just past the upper end of the curved boundary, in that region.
Point A lies in the region above the steep (solid-liquid) boundary, point C sits close to the triple point between the phase boundaries, and point D lies below the vapour-pressure curve in the gas region. None of these is beyond the critical point.
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