Abstract
In a recent paper, Ogawa1 has proposed a statisticalmechanical method based on the so-called site-occupying model (SOM) to evaluate hydrogen solubility in metals. Ogawa claims that SOM is in much better agreement with experimental data than site blocking models (SBM). I am at variance with this opinion. The objective of this paper is to compare both approaches. I shall restrict myself to the configurational contribution to the partial molar mixing entropy of hydrogen, which concentrates on the main points of divergences.
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