Imagine a substance with the following points on the phase diagram: a triple point at 0.5 atm and - 5 °c; a normal melting point at 20 °c, a normal boiling point at 150 °c; and a critical point at 5 atm and 1000 °c. the solid-liquid line is "normal" (i. e. positive gradient). roughly sketch and label the phase diagram. annotate all important areas and points.