
10
Overview to Perturbation
Theories for More
Complex Systems
In this chapter, we give a quick look at the theoretical description of more complex
systems, such as fluids near the critical point, electrolyte solutions, liquid metals,
polymers, colloids, and protein solutions. The complexity of the fluids near the critical
point arises from the large-scale fluctuations involved. Most of the theories analyzed
in Chapters 4, 6 through 9 fail to provide accurate results near the critical point
unless appropriate corrections are introduced, as will be explained in Section 10.1.
In the remaining systems considered in this chapter, the complexity arises from ...