Viscosity (Newton's Law)

📊 advanced

$$F = -\eta A \frac{dv}{dx}$$

Viscous force between fluid layers is proportional to area and velocity gradient.

Variables & Units

$dv/dx$

Velocity gradient

Unit: $s^{-1}$

Key Information

📐 Derived From

Newtonian fluid properties.

💡 Example

Resistance to flow in oil vs water.

🔧 Applications

Lubrication engineering.

⚠️ Constraints

Streamline flow.

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