What will be the boiling point of fully-filled water in a vacuum container?

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    Boiling Point Water
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Discussion Overview

The discussion centers around the boiling point of water in a vacuum container, particularly in the context of a computer cooling system where water is used as a coolant. Participants explore the implications of vacuum conditions on boiling behavior and pressure-temperature relationships.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the feasibility of achieving a total vacuum in the presence of water, suggesting that any available space above the water would be filled with water vapor at the partial pressure corresponding to the water's temperature.
  • Another participant describes a scenario where applying a vacuum to a closed water reservoir would lead to boiling until only water vapor remains, potentially resulting in a total vacuum if the chamber is sealed.
  • A participant mentions that if the chamber is completely filled with liquid water and sealed, the pressure would rise significantly as the water expands when heated, risking a burst of the chamber.
  • Some participants express uncertainty about the constraints of the scenarios being discussed, highlighting the need for clarity in the conditions being considered.
  • One participant provides a link to a saturated steam table app for exploring the properties of water and steam at various pressures, suggesting it could aid in understanding the boiling point under different conditions.
  • A later post reiterates the initial question about the boiling point of water in the cooling chamber and requests a sketch to illustrate the configuration being discussed.
  • Another participant introduces a related technology, the steam-refrigeration cycle, which utilizes low-pressure steam/water, suggesting a connection to the topic at hand.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of achieving a vacuum with water present, and the implications for boiling behavior remain contested. The discussion does not reach a consensus on the boiling point under the described conditions.

Contextual Notes

Participants note the complexity of the scenarios and the potential for misunderstanding due to the lack of clear definitions and constraints regarding the vacuum conditions and the behavior of water in those conditions.

chandlerchoi
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What will be the boiling point of the fully filled water in a vacuum container? Let's say I vacuum the container first, then fill it the water in it from water reservoir of same vacuum level
 
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Welcome to PF.

You ask an impossible question.
There can be no total vacuum in the presence of water.

If there is any space available in the container above the water, the vacuum of that space will be filled immediately by water vapour, at the partial pressure of water for that temperature water and container.
https://en.wikipedia.org/wiki/Vapour_pressure_of_water
 
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Thank you for the reply.
Let me elaborate more.
what I am thinking is... in the computer cooling system, if we vacuum the water reservoir of coolant (water), what will be the boiling point of the water in the cooling chamber above the CPU.
Since water coolant flows, the cooling chamber will be filled up with water all the time. so I wrote "vacuum container" to describe "cooling chamber environment"
in this configuration, does the water in the chamber with no gas/air follows the pressure-temperature graph?
 
If you apply a vacuum to the closed water reservoir, at any temperature, the water will boil until there is only water vapour remaining. Then the pressure will fall until the chamber is dry, and is a total vacuum.

If you seal a chamber, that is completely filled with liquid water, without a safety valve or sufficient airspace, then as the water is warmed, the water will expand, the pressure will rapidly rise, until the chamber bursts.
 
chandlerchoi said:
Thank you for the reply.
Let me elaborate more.
what I am thinking is... in the computer cooling system, if we vacuum the water reservoir of coolant (water), what will be the boiling point of the water in the cooling chamber above the CPU.
Since water coolant flows, the cooling chamber will be filled up with water all the time. so I wrote "vacuum container" to describe "cooling chamber environment"
in this configuration, does the water in the chamber with no gas/air follows the pressure-temperature graph?
Can you please provide a sketch?
 

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