This function passes through a minimum at xB = 0.5, at which point, l'Hopital's rule shows that r = 2. No mathematical solutions exist for r < 2, which physically means that the system is a single phase solution for all compositions. For r > 2, the same value of r is obtained for xB and 1 - xB.

To convert Eq (8.19) to the equation for the phase diagram (i.e., T Vs xB), the maximum r = 2 is equivalent to a unique temperature T* through Eq (8.18):

T* is called the critical solution temperature. It is a property of the A-B binary system that reflects its nonideal behavior, as represented in the regular solution approximation.

With the help of Eqs (8.18) and (8.20), Eq (8.19) becomes:

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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