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A sample of water ice at atmospheric pressure has a

Chapter 17, Problem 53P

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QUESTION:

A sample of water ice at atmospheric pressure has a temperature just below the freezing point. Refer to Figure 17–28 to answer the following questions. (a) What phase changes occur if the temperature of the system is increased while the pressure is held constant? (b) Suppose, instead, that the temperature of the system is held constant just below the freezing point while the pressure is decreased. What phase changes occur now?

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QUESTION:

A sample of water ice at atmospheric pressure has a temperature just below the freezing point. Refer to Figure 17–28 to answer the following questions. (a) What phase changes occur if the temperature of the system is increased while the pressure is held constant? (b) Suppose, instead, that the temperature of the system is held constant just below the freezing point while the pressure is decreased. What phase changes occur now?

ANSWER:

Step 1 of 3

The phase diagram for water shows the pressures and temperatures for which water is in the solid, liquid, and vapor phases. The sample of water ice begins at atmospheric pressure just below the melting temperature.

a) All three curves on the phase diagram meet at a single point, the triple point, where all three phases exist in equilibrium.

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