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The question in your image asks to determine the temperature at which "Substance X" turns into a gas if the pressure above the solid is 0.22 atm, using the phase diagram shown.

From the phase diagram:
1. You need to locate the pressure of 0.22 atm on the vertical axis.
2. Follow horizontally until the line between the solid and gas regions is intersected.
3. The corresponding point on the temperature axis gives the temperature at which the substance changes from solid to gas.

After analyzing the diagram, at 0.22 atm, the temperature at which the substance transitions to gas is approximately **200 K**.

Finally, to convert from Kelvin to Celsius:
\[
\text{Temperature in Celsius} = \text{Temperature in Kelvin} - 273.15
\]
\[
\text{Temperature in Celsius} = 200 - 273.15 = -73.15^\circ C
\]

So, the temperature at which Substance X turns into a gas is about **-73°C**.

Would you like any further details or explanations?

### Related Questions:
1. What is the significance of the triple point in a phase diagram?
2. How do phase diagrams help in understanding states of matter?
3. What happens during sublimation, and how is it depicted on a phase diagram?
4. How would an increase in pressure affect the phase transitions of Substance X?
5. What are the typical applications of phase diagrams in real-world scenarios?

### Tip: 
In phase diagrams, the lines between phases indicate equilibrium points where two phases coexist, such as solid-gas for sublimation or liquid-gas for vaporization.

Use the phase diagram of Substance X below to find the temperature at which X turns to a gas, if the pressure above the solid is 0.22 atm.

Learn how to use a phase diagram to find the temperature at which Substance X transitions into gas at 0.22 atm. Includes key concepts in phase transitions, pressure-temperature relations, and Kelvin-Celsius conversions. Suitable for high school students.

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