Henry's law revisited

Henry's Law is a commonly used method for calculating phase equilibria, particularly, but not exclusively, the solubility of a gas in a liquid. An earlier article presented various forms of Henry's Law and concentrated on the effect of pressure and solute concentration. A subsequent article covered the application of Henry's Law to multicomponent mixtures. A third article placed Henry's Law in a historical law. Those publications proved to be quite popular and generated a lot of discussion, which has become the basis of this article. In this article, a few more Henry's Law concepts are presented in the hope that it will answer some of the questions posed since the original article.