Let r be a nonzero real constant. Suppose we have a swimming motion, then we can do the following scaling: p ↦ ↦ r p ; u ↦ ↦ r u ; σ σ ↦ ↦ r σ σ and obtain another solution to the Stokes equation. That is, if we scale hydrostatic pressure, flow-velocity, and stress tensor all by r , we still obtain a solution to the Stokes equation.