Eddy viscosity is proportional to the square of one value of this quantity in a model named for it developed by Prandtl. The square root of little g times one value of this quantity appears in the denominator of the Froude number that (-5[1])models ship behavior. Ballistic electrons have a large value of one form (15[1])of this quantity relative to the surrounding material. The ratio between two characteristic values of this quantity defines the (*) Knudsen (-5[1])number and determines if continuum mechanics apply. This quantity times dynamic (-5[1])viscosity over (10[1])kinematic (-5[1])viscosity defines the Reynolds (-5[3])number. The average value of this quantity between (10[1])collisions in a gas (10[1])is the mean free (10[1]-5[2])path. For 10 points, the volume of fluid inside a pipe equals cross-sectional area times what (-5[1])quantity with units of (10[1])meters? (10[16]0[2])■END■