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JII
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can cold air become water in a vacuum cylinder?
Can cold air become water in a vacuum cylinder?
In summary, water canbecome a liquid at a certain temperature and pressure, but doing it in a vacuum is not possible.
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russ_watters
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Welcome to PF!
That's a confusing question: water isn't air. So either you mean condensing water vapor that is in the air or liquefying the air. Either can be done if cold enough, but trying to do it in a vacuum works against you.JII said:
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JII
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Yes, water vaporruss_watters said:
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Comeback City
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If you apply a cold enough temperature, then yes it is possible.JII said:
And...
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JII
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Why would the vacuum work against me?JII said:
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russ_watters
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Check out the phase diagram for water or a steam table; As you reduce the pressure, the boiling point goes down.JII said:
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JII
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Okayruss_watters said:
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sophiecentaur
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Let me re-state "cold air" as "a mixture of cold air and water". Is that OK?JII said:
The answer to your question will depend upon the Temperature and the value of the pressure in your "vacuum cylinder". If you look at the Phase Diagram in this link, it shows how the phases of water depend on the pressure / temperature combination. There is a "triple Point" for water (around 0°C) at which water can exist as solid, vapour and liquid and move from one to another. The state of the water, as you leave that point in various directions, is shown on the diagram. One simple fact emerges and that is that water can't exist as liquid towards the bottom left corner of the diagram, for any finite value of low pressure, there is a temperature at which water will pass from [edit] vapour to sold and back, without going through a liquid phase (called Sublimation).
The presence of Air, doesn't make any significant difference to the situation.
Last edited:
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JII
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Thanks :)sophiecentaur said:
Related to Can cold air become water in a vacuum cylinder?
1. Can cold air turn into water in a vacuum cylinder?
Yes, cold air can turn into water in a vacuum cylinder under certain conditions.
2. How does cold air turn into water in a vacuum cylinder?
Cold air turns into water in a vacuum cylinder through a process called condensation. When the air inside the cylinder cools, the water vapor in the air begins to condense and turn into liquid water.
3. What is the temperature at which cold air turns into water in a vacuum cylinder?
The temperature at which cold air turns into water in a vacuum cylinder is known as the dew point. This temperature varies depending on the amount of moisture in the air and the pressure inside the cylinder.
4. Can water turn back into air in a vacuum cylinder?
No, once water has condensed in a vacuum cylinder, it cannot turn back into air. The water molecules have undergone a physical change and can only return to a gaseous state through a process called evaporation.
5. Why does cold air turn into water in a vacuum cylinder?
Cold air turns into water in a vacuum cylinder because of the decrease in temperature and pressure inside the cylinder. As the air cools, its ability to hold water vapor decreases, causing the water vapor to condense and form liquid water.
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