Strongly dipolar fluids at low densities

We propose a simple statistical mechanical theory for a strongly dipolar fl uid at low densities, based on the analogy between a system of polydisperse Linear chains and the equilibrium structure of these fluids as revealed by computer simulations. At low densities, both steric and dipolar interactio ns between long chains are weak and thus the dipolar fluid is well describe d as an ideal gas of polydisperse chains. We have further investigated how the residual dipolar interaction between monomers and/or additional isotrop ic attractions between the spheres cause the dissociation of the chains and /or the condensation of the dipolar fluid.