Drag depends on inertia (the tendency to stay put). Inertia is proportional to mass. Fluid density or mass per unit volume is the important factor for our discussion.

Drag comes in two important varieties. Form drag is determined by shape. Friction drag is determined by the nature of the surface. Friction is discussed in terms of viscosity or how readily one layer slips past another.

An important concept in the study of aerodynamics conce

With total drag being the consequence of a combination of shape and friction components, swimmers are limited to various degree by size and speed. Large and small swimmers experience very difference dynamic environments in the same fluid. Whereas a dolphin might seemingly slip through the water, a microscopic organism appears to be slogging through syrup.

Measured flows traveling over the top of a lifting airfoil do move faster than those going underneath. But they travel much faster than the speed required to have the molecules meet up at the back end. Two molecules near each other at the leading edge will not end up next to each other at the trailing edge. Why should they? Molecules have no "knowledge" of their neighbors - they're inanimate. In fact, molecules are in constant

Some common words found in the essay are:
, stationary layer, molecules near, thickness stationary layer, thickness stationary, thinner stationary layer, speed faster, meet molecules, drag determined, shape friction, trailing edge, thinner stationary, travel faster,
Approximate Word count = 529
Approximate Pages = 2 (250 words per page double spaced)