I've occasionally heard it said that "For a bacteria, moving through water is like a person trying to wade through liquid concrete" (or jello, or mud, or whatever...) What is a good layman's explanation for this scaling of viscosity? Is it simply that at the scale of a bacterium, the strength of the intermolecular forces in a fluid are more comparable to the strength that a bacterium has to push itself through the fluid, or is there something deeper to it?
posted by badstone on Jun 28, 2004 - 3 answers