Pressure due to boiling a liquid

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SUMMARY

The discussion centers on determining the pressure produced by boiling liquid nitrogen at 0°C (273K). It is established that the pressure corresponds to the saturated vapor pressure at that temperature, which can be found using a phase diagram or steam tables. The pressure at this point is approximately 500 psi. The conversation also highlights the importance of understanding the liquid-gas transition and correcting common misconceptions about temperature scales.

PREREQUISITES
  • Understanding of phase diagrams, particularly for nitrogen.
  • Familiarity with saturated vapor pressure concepts.
  • Knowledge of temperature scales, specifically Celsius and Kelvin.
  • Access to steam tables or thermodynamic resources.
NEXT STEPS
  • Research the phase diagram of nitrogen to visualize the liquid-gas transition.
  • Study saturated vapor pressure calculations for various liquids.
  • Explore thermodynamic properties of nitrogen at different temperatures.
  • Review steam tables for accurate pressure readings at specified temperatures.
USEFUL FOR

Students and professionals in thermodynamics, chemical engineering, and anyone involved in cryogenics or the study of phase transitions in liquids.

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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 celsius 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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