We’re being asked to determine what three forms of ice present at the triple point marked O. Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.
In a phase diagram:
• Triple Point: the point at which three phases are in equilibrium
• Critical Point: the point at which the liquid and gas phases coexist. The resulting phase is a supercritical fluid.
The high-pressure phase diagram of ice is shown at the top of the next column. Notice that, under high pressure, ice can exist in several different solid forms .
What three forms of ice are present at the triple point marked O?
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