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According to the phase diagram for H2O, what happens to the phases of water at 0.5 atm pressure as the temperature is decreased from 110C to -10C?

Question

According to the phase diagram for H2O, what happens to the phases of water at 0.5 atm pressure as the temperature is decreased from 110C to -10C?

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Solution

According to the phase diagram for H2O, at 0.5 atm pressure:

  1. Starting at 110C, water is in the gaseous phase (steam).

  2. As the temperature decreases, we cross the condensation line (around 100C at this pressure). This is where water changes from a gas to a liquid.

  3. Continuing to decrease the temperature, water remains in the liquid phase until we reach the freezing point (around 0C at this pressure).

  4. Below 0C, water changes from a liquid to a solid (ice).

So, as the temperature decreases from 110C to -10C at 0.5 atm pressure, water goes from being a gas to a liquid and then to a solid.

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