Pressure due to boiling a liquid

AI Thread Summary
To determine the pressure produced by boiling a liquid, one must refer to the saturated vapor pressure at the specific temperature, which can be found in steam tables or thermodynamic textbooks. For liquid nitrogen at 273K (0°C), the pressure at the liquid-gas transition is approximately 500 psi. It's important to note that heating nitrogen to 0K is incorrect, as it is an extremely low temperature; instead, nitrogen should be cooled. The discussion also highlights the significance of understanding phase diagrams for accurate pressure calculations. Accessing a reliable phase diagram for nitrogen is essential for further analysis.
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I am looking for an equation to determine the pressure produced by boiling a liquid.
(On the net I can only find information on the effect that pressure has on boiling point)

for example, the pressure produced by heating liquid nitrogen to 0K.

Any help would be great!

Thank you
 
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"Boiling" means to heat a liquid to where the partial pressure of the gas is above ambient pressure. So if you confine a liquid and heat it, the pressure produced corresponds to the partial pressure or saturated vapor pressure at that temperature. You find this from a table, ie a steam table or similar. There are some on the web and any good thermo book will have a bunch of tables for different fluids in it.

Tables for Nitrogen might not go up that high - the pressures would be huge as that is well above the critical point for nitrogen (the point at which you can no longer distinguish liquid from gas - you can no longer define "boiling").
 
You wouldn't heat Nitrogen to zero Kelvin. You would cool it.

Zero Kelvin is really cold.
 
russ_watters said:
Lol, sorry - I saw 0K and thought 0C.

You could talk to Redbelly about my blunder converting between Celcius and Kelvin. It went on for several posts :redface:
 
Phrak said:
You wouldn't heat Nitrogen to zero Kelvin. You would cool it.

Zero Kelvin is really cold.

I meant heat Liquid Nitrogen to 0C (273K)
 
Look up the phase diagram of N2. Pick the coordinate were the temperature is 273K. Where this line crosses the liquid-gas transition is the pressure you are interested in.

It looks like about 500 psi to me.
 
Last edited:
Do you have a link to a phase diagram? I couldn't find one.
 
Phrak said:
Look up the phase diagram of N2. Pick the coordinate were the temperature is 273K. Where this line crosses the liquid-gas transition is the pressure you are interested in.

It looks like about 500 psi to me.


Hero!

Many thanks!
 
  • #10
russ_watters said:
Do you have a link to a phase diagram? I couldn't find one.

I googled images for N2 phase diagram. I only found a crude one.
 

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