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In curved streamlines, there is a pressure gradient perpendicular to the flow. This relationship is often even more helpful for interpreting the pressure distribution when flowing around bodies than the Bernoulli equation, which applies along the streamlines. The Bernoulli equation can only be used to calculate the other value if pressure or speed is known. In viscous fluids, the application of the Bernoulli equation is also very limited. On the other hand, areas with excess or negative pressure can be easily derived from the curvature of the streamlines, which can be estimated from the shape of a body near it. 0:00 Clear explanation 8:49 Derivation of the Bernoulli equation 13:40 Derivation dp/dr = ϱ u²/r 16:57 Experiment 18:22 Clear derivation dp/dr = ϱ u²/r 21:07 Summary