A quantity of this type times q must be less than 1 for points on a Zimm plot, which is used to calculate the second virial coefficient, molecular mass, and this quantity. One quantity of this type multiplies 6 pi and viscosity in the denominator of the Stokes-Einstein (-5[1])relationship, which allows it to be calculated in dynamic light scattering. Apparently, (-5[1])values of the hydrodynamic (-5[2])form of this quantity may serve as an approximation of (*) volume in gel permeation chromatography. The root mean square volume of this quantity for a macromolecule is also called this value “of gyration.” (-5[1])A form of this quantity measured in angstroms is cubed (-5[1])in the formula for the van der Waals (-5[1])volume. For 10 points, name this quantity, the sum of which for two bonded atoms equals the bond length. (0[1])■END■ (10[4]0[1])