Goetz, in Studies in Interface Science, 2010 2.6.1 Interactions of Colloid Particles in Equilibrium: Colloid Stability For example, I remember that towards the end of 1946, at the Brussels IUPAP meeting, after a presentation of the thermodynamics of irreversible processes, a specialist of great repute said to me, in substance: “I am surprised that you give more attention to irreversible phenomena, which are essentially transitory, than to the final result of their evolution, equilibrium.” Īndrei S. It is difficult today to give an account of the hostility that such an approach was to meet. Affinity is still regarded with suspicion by some scientists, as it was when De Donder introducedthe term. Affinity was not used or referred to in the textbook that dominated thermodynamics education in the United States for the middle years of the twentieth century. (Similarly, each geographic location has a different value of “distance” depending on what possible destination is considered.) Such complex notions disturb many. Affinity is the measure of the distance (in energy units) of the actual state of a system from some one (specified) possible equilibrium condition of the same system. Since it is usual that many diverse reactions are possible for a particular sample, each sample has as many different values of affinity as there are possible reactions. Each sample has a specific value of affinity for each chemical reaction that might possibly occur. Where K is the equilibrium constant for that reaction, and Q has the same form as an equilibrium constant but involves actual rather than equilibrium concentrations.
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