[Cz-physics] Response to Alexander Patrakov

[mbeychok]

Alexander, thanks for your response.

Figure 2 is based on the work of Gouq-Jan Sen in 1946 (see reference 7 
included in the Figure 2).  It was based on literally hundreds of data 
points for the 10  gases listed in my CZ article. Detailed copies of his 
original graph are available in many places in the literature. You can 
view a full-size, detailed copy of the original graph  (including the 
data points) by visiting Professor Kadem's online article (the link in 
reference 8).

Figure 2 is a much smaller version of the original and does not include 
the data points, in order to make the smaller version readable ... and 
it is purposely meant to be only a small illustrative example of that 
type of chart.

Figure 2 does not show the area above Z = 1 because to do so would 
require a very much wider chart. Figure 2 only shows the reduced 
pressure range (Pr) from 0.0 to 4.0 .... if extended to a much higher 
reduced pressure range, the reduced temperature (Tr) isotherms would 
extend to Z greater than 1. 

The lower graph in Figure 1 (for methane) extends to Z values greater 
than 1 because the pressure range in Figure 1 extends to a pressure of 
300 bar. 

It indeed would be interesting to include a plot (similar to Figure 2)  
using Z values calculated by using van der Waals  equation  ... if such 
a diagram could be found in the literature.  To create such a plot 
myself would involve a very great deal of effort and time and I am not 
inclined to do that. If you or anyone else knows of such a plot in the 
readily available literature, I would endeavor to create an illustrative 
simulation of that graph.

Regards,

Milton Beychok  (http://en.citizendium.org/wiki/User:Milton_Beychok)
1102 Colony Plaza
Newport Beach, CA 92660, USA

Phone: 949-718-1360
Web Site: http://www.air-dispersion.com
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