A PDF can't show motion. When you read about "laminar vs turbulent flow," immediately go to YouTube and search "Laminar flow fluid mechanics visual." Seeing dye flowing in a smooth line vs. swirling is worth a thousand words.
Imagine water flowing through a calm, straight pipe. The fluid moves in smooth, parallel layers. The molecules in the center move fastest, while those touching the wall barely move due to friction. fluid mechanics for dummies pdf
A: Most engineers say fluid mechanics is harder because you can’t see the flow. Thermodynamics has distinct states (hot, cold, high pressure). Fluid dynamics has continuous, invisible motion. That is why a visual PDF with diagrams is crucial. A PDF can't show motion