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A COMPARISON BETWEEN THE KINETIC THEORY OF - page 13 / 25

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The "kinetic contribution" is due solely to the molecular motion; this is the only contribution for the ideal monatomic gas. The "external force contribution" takes into account the different forces acting on the various beads, because of electric charges. The "intramolecular force contribution" accounts for the tensions in the springs that cross a plane in the fluid. Finally, the "intermolecular force contribution" accounts for the bead-bead interactions for beads on two different (d) molecules. The R's appearing in these expressions are:

= position vector for bead with respect to the center of

mass of molecule

= vector from bead to bead

= vector from bead to bead

= vector from the center of mass of molecule to the

center of mass of molecule

In addition is the two-molecule configurational distribution function. Now the contribution does not seem to be taken into account in the so-called "tube" models for undiluted polymers. No explanation is ever given for the omission of this contribution, and, to date, no one has attempted to make an estimate of its size.

When we make the choice for B given in Eq. 2.11, we then get the energy equation:

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