The editors have received a letter from one of our readers, Dr. van Poolen. He points out that a recent publication by H. Grine and H. Madani (hthp 51, 39-61, 2022) contains an inconsistency. Dr. van Poolen has provided detailed step-by-step calculations highlighting the error and its consequences. These calculations are available upon request, but are too lengthy to be reproduced here. Instead, we have decided to summarize his letter and his findings in the following, together with the author's (H. Grine) reply. "Dear Editor of the HTHP Journal: As an affiliate for many years with the Fluid Properties Group at the National Institute of Science and Technology in Boulder, CO, I am intrigued by the paper "Method for prediction of liquid-vapor critical points in binary mixtures: geometrical-EOS model", published in High Temperatures High Pressures, Vol 51, pp. 39-61. It appears to be a simple, innovative method to correlate binary mixture critical data.
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