Understanding Viscosity
The Science of Fluid Flow
Learn About ViscosityViscosity measures a fluid's resistance to flow—how "thick" or "thin" it behaves. Honey flows slowly (high viscosity); water flows easily (low viscosity). Understanding viscosity is crucial for lubricants, paints, food processing, and engineering.
Common Fluid Viscosities
| Fluid | Dynamic (cP) | Comparison |
|---|---|---|
| Air | 0.018 | Very thin |
| Water (20°C) | 1.0 | Baseline |
| Olive oil | 80 | 80× water |
| Motor oil (SAE 30) | 150-200 | ~150× water |
| Honey | 2,000-10,000 | ~5,000× water |
| Ketchup | 50,000-100,000 | Varies with shear |
Conclusion
Viscosity affects how fluids pump, flow, and lubricate. Temperature significantly impacts viscosity—most fluids thin when heated. Non-Newtonian fluids like ketchup change viscosity under stress. Proper viscosity specification ensures products perform as intended.