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Data for a number of vinyl polymer‐solvent systems show that the constant Ks in the relation 1/S = (1/S0) (1 + KsC) (where S and S0 are sedimentation constants at the concentration C and zero respectively) is proportional to the intrinsic viscosity. The average constant of proportionality is 1.6. Assuming the Mandelkern‐Flory theory of the relation of frictional coefficient and intrinsic viscosity to root‐mean‐square end‐to‐end distance and Burgers' relation for the sedimentation constant of a dilute suspension of spheres, the ratio Ks/[η] is calculated to be 1.66. Molecular weights may be calculated from Ks and the limiting sedimentation constant, S0 without the use of the constants Φ and P, and agree well with molecular weights determined independently. These considerations apparently do not apply to cellulose derivatives, for which Ks is not proportional to [η].

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