Subject: ?s re variables in Stokes-Einstein eqn.

From: "Shapiro, Stuart {Basi~Basel}" <[email-masked]>
Date: Mon, 25 Mar 2002 09:05:09 +0100

Dear Colleagues,

	In the Stokes-Einstein equation for the diffusion coefficient for spherical molecules, is the radius of the molecule under consideration taken to be the hydrodynamic radius, the radius of gyration, or some other kind of radius?  Also, in this equation is the viscosity taken to be the shear viscosity, intrinsic viscosity, kinematic viscosity, or some other kind of viscosity?

	Along the same lines, if you measure the viscosity of a solution using a Ubbeholde capillary viscometer, are you measuring the kinematic viscosity, the shear viscosity, the relative viscosity, or some other kind of viscosity?

	Kind address responses to me _directly_ at

[email-masked]

Thanks in advance to all responders,

S. Shapiro
[email-masked]