Task: Text Categorization
Input (English): In magnetohydrodynamics it determines whether or not a magnetic field will diffuse away or remain frozen in the plasma and its magnetic version is dependent on the velocity and electrical conductivity of a plasma. It is involved in a solution of the Hagen-Poiseuille equation used to approximate the Darcy friction factor and the drag coefficient must be a universal function of it. This quantity is highly dependent on the characteristic length of the region of fluid flow, and is proportional to the ratio of a fluid's inertia to its kinematic viscosity. When this value is low, it corresponds to a smooth, layered flow. For 10 points, identify this dimensionless quantity related to the turbulence of a fluid.
Output (English): Science