Density computation for high temperature, low pressure argon

In summary, the conversation discusses the use of the ideal gas law to compute the density of argon at high temperatures and low pressures. It is suggested that argon, being largely non-reactive, may be an exception to the typical gases that do not follow the ideal gas law in such conditions. However, it is noted that the ideal gas law cannot be used for gases like nitrogen (N2) that dissociate at high temperatures, unless there is experimental data available.
  • #1
pyroknife
613
3
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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  • #2
So far above http://www.nist.gov/data/PDFfiles/jpcrd363.pdf and so far below pc the ideal gas law is perfect.
 
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  • #3
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##.
 
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  • #4
You can use the ideal gas law for N under those (dissociated) conditions.
 
  • #5
BvU said:
You can use the ideal gas law for N under those (dissociated) conditions.
But not for ##N_2## correct?
 
  • #6
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: !
 
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1. What is the significance of density computation for high temperature, low pressure argon?

Density computation for high temperature, low pressure argon is important for various industrial and scientific applications, such as in the production of semiconductors and plasma processing. It also helps in understanding the behavior of gases at extreme conditions, which is essential for designing and improving various technologies.

2. How is density of high temperature, low pressure argon calculated?

The density of high temperature, low pressure argon can be calculated using the ideal gas law, which states that the product of pressure and volume is directly proportional to the number of moles of gas and its temperature. Other methods such as experimental measurements and theoretical models can also be used to compute the density.

3. What are the factors that affect the density of high temperature, low pressure argon?

The density of high temperature, low pressure argon is primarily affected by temperature and pressure. Other factors such as the atomic mass of argon, intermolecular forces, and the presence of impurities can also influence the density. Additionally, changes in physical state, such as the gas transitioning to a liquid or solid, can also impact the density.

4. How does the density of high temperature, low pressure argon compare to that of other gases?

The density of high temperature, low pressure argon is relatively low compared to other gases, such as oxygen and nitrogen. This is because argon is a noble gas and has a lower atomic mass, leading to lower molecular weight and density. However, at high temperatures and low pressures, the density of argon can increase due to thermal expansion and decreased intermolecular forces.

5. Why is it important to accurately compute the density of high temperature, low pressure argon?

Accurate density computation is crucial for understanding the behavior and properties of gases at extreme conditions. It can also aid in the design and optimization of various industrial processes and technologies that utilize argon. Additionally, precise density measurements can provide valuable data for further research and development in the field of thermodynamics and gas dynamics.

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