In reply to AlanG's message of Fri, 20 Feb 2015 11:44:26 -0800: Hi Alan, Have you taken account of Hydrogen absorption by the rod?
>My final report on the pressure is now available at >http://tinyurl.com/pdrd224 > >It includes corrections for thermal expansion and the van der Waals >effect. Your comments and suggestions will be welcome as always. > >AlanG > >On 2/20/2015 8:28 AM, Bob Higgins wrote: >> Yes Bob, Thanks. >> >> The effect due to thermal expansion has been evaluated by Alan >> Goldwater to be a fraction of a percent. This pales in comparison to >> the ~40% effect of the 2-volume 2-temperature calculation, the ~12% >> effect of van der Walls vs. ideal gas, and the uncertainties in the >> actual mass of LiAlH4. But, it should be a part of the calculation. >> >> Another effect that could be at least as large is the mechanical >> expansion of the alumina tube under the forces of the high pressure. >> Thermal expansion increases the size of both the displacement rod and >> the tube, but mechanical strain would only increase the tube diameter, >> causing a bigger change in the dead volume. >> >> Bob Higgins >> Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
