Density computation for high temperature, low pressure argon

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Discussion Overview

The discussion revolves around the computation of the density of argon at high temperature (7000 K) and low pressure (21331 Pa). Participants explore the applicability of the ideal gas law under these conditions, particularly considering the behavior of argon compared to other gases like nitrogen.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the appropriateness of using the ideal gas law for argon at the specified conditions, suggesting that typical gases may not behave ideally at high temperatures and low pressures.
  • Another participant asserts that the ideal gas law is valid in the specified range, referencing a source that supports this claim.
  • A participant raises a comparison with nitrogen gas, noting that nitrogen may dissociate at high temperatures, which could affect the applicability of the ideal gas law.
  • There is a suggestion that the ideal gas law could still be applicable for dissociated nitrogen under certain conditions.
  • One participant humorously implies that the absence of certain data might invalidate the use of the ideal gas law.

Areas of Agreement / Disagreement

Participants express differing views on the applicability of the ideal gas law for argon and nitrogen under the given conditions. There is no consensus reached regarding the use of the ideal gas law for these gases at high temperature and low pressure.

Contextual Notes

Participants reference specific conditions related to critical temperature and pressure, as well as the behavior of different gases, which may affect the validity of the ideal gas law. However, these conditions and their implications remain unresolved in the discussion.

pyroknife
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I am trying to compute the density of argon given the following conditions:
T = 7000 K
P = 21331 Pa

For typical gases, I do not believe the ideal gas law would hold for such a high temp&low pressure regime, but since Argon is largely non-reactive, do you guys think using the ideal gas law would be appropriate here to compute the density?
 
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So far above http://www.nist.gov/data/PDFfiles/jpcrd363.pdf and so far below pc the ideal gas law is perfect.
 
Last edited by a moderator:
BvU said:
So far above http://www.nist.gov/data/PDFfiles/jpcrd363.pdf and so far below pc the ideal gas law is perfect.
Hmm thank you for the post. Is this largely become Ar is an atom?

For example, I cannot use the ideal gas law if it was instead nitrogen gas (N2) since it will dissociate before this temperature, but I believe the temperature is above ##T_c## and the pressure is below ##P_c##.
 
Last edited by a moderator:
You can use the ideal gas law for N under those (dissociated) conditions.
 
BvU said:
You can use the ideal gas law for N under those (dissociated) conditions.
But not for ##N_2## correct?
 
If there is no http://www.nist.gov/data/PDFfiles/jpcrd39.pdf http://www.nist.gov/data/PDFfiles/jpcrd39.pdf then you can't use the ideal gas law, correct :smile: !
 
Last edited by a moderator:

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