Consider a specimen of ice that is at –10°C and 1 atm pressure. Using Figure 10.2, the pressure–temperature phase diagram for H2O, determine the pressure to which the specimen must be raised or lowered to cause it (a) to melt and (b) to sublime.
Figure 10.2 Pressure–temperature phase diagram for H2O. Intersection of the dashed horizontal line at 1 atm pressure with the solid–liquid phase boundary (point 2) corresponds to the melting point at this pressure (T = 0°C). Similarly, point 3, the intersection with the liquid–vapor boundary, represents the boiling point (T = 100°C).
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