This video is not reversed, it all has to do with laminar flow and Reynolds number. Laminar flow occurs when a fluid flows in parallel layers, with no disruption between the layers. The Reynolds number is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. At low Reynolds numbers, flows tend to be dominated by laminar flow, while at high Reynolds numbers, flows tend to be turbulent. Laminar flow and R