Physical state given the critical temperature and critical pressure

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SUMMARY

This discussion focuses on determining the physical states of two substances, H2O and CH3OH, given their temperature (T) and pressure (P) in relation to their critical temperatures and pressures. The Antoine equation is recommended for calculating saturation pressure, which is essential for identifying the phase of the substances. Additionally, the use of a phase diagram is suggested, with emphasis on plotting pressure on a logarithmic scale to accurately locate the relevant points for analysis.

PREREQUISITES
  • Understanding of the Antoine equation for saturation pressure calculation
  • Familiarity with phase diagrams and their interpretation
  • Knowledge of critical temperature and pressure concepts
  • Experience with graphical plotting techniques, particularly on logarithmic scales
NEXT STEPS
  • Research the Antoine equation and its application in thermodynamics
  • Study phase diagrams specific to H2O and CH3OH
  • Learn how to plot data on a logarithmic scale using software tools
  • Explore the relationship between critical properties and phase behavior of substances
USEFUL FOR

Chemical engineers, thermodynamics students, and researchers involved in phase behavior analysis of substances under varying temperature and pressure conditions.

A13235378
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Moved from a technical forum, so homework template missing
Summary:: I have two substances H2O and CH3OH given at a temperature T and pressure P.

I also have critical temperatures and pressures.

How can I find the physical states of these substances.

My teacher recommended me to use the Antoine equation and find the saturation pressure, but I can't see how it can help me. I tried it on a phase diagram, but I couldn't find one that would provide the right scale. I can't find exactly where the point is.
 
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You will have to provide a more complete description of the problem you are trying to solve.
 
A13235378 said:
Summary:: I have two substances H2O and CH3OH given at a temperature T and pressure P.

I also have critical temperatures and pressures.

How can I find the physical states of these substances.

My teacher recommended me to use the Antoine equation and find the saturation pressure, but I can't see how it can help me. I tried it on a phase diagram, but I couldn't find one that would provide the right scale. I can't find exactly where the point is.
Have your graphics package plot the pressure on a log scale.
 

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