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Overview
Dynamic viscosity measures a fluid’s internal resistance to flow (units Pa·s, poise, etc.). Kinematic viscosity is dynamic viscosity divided by density (units m²/s, Stokes, etc.). Use this tool to pivot between both categories effortlessly.
Formula & Methodology
**Dynamic:** Convert everything to Pa·s: $$ \eta_{\rm Pa\!·s} = \eta_{\rm input} \times f_{\rm from}, \quad \eta_{\rm out} = \frac{\eta_{\rm Pa\!·s}}{f_{\rm to}} $$
**Kinematic:** Convert to m²/s: $$ \nu_{\rm m²/s} = \nu_{\rm input} \times g_{\rm from}, \quad \nu_{\rm out} = \frac{\nu_{\rm m²/s}}{g_{\rm to}} $$
| Unit | Symbol | Factor → Pivot | Note |
|---|---|---|---|
| Pa·s | Pa·s | 1 | SI dynamic |
| Poise | P | 0.1 | CGS dynamic |
| lb/(ft·h) | lb/(ft·h) | 4.133789e-4 | Imperial |
| lb/(ft·s) | lb/(ft·s) | 1.488164 | Imperial |
| lbf·s/ft² | lbf·s/ft² | 47.88026 | Mech stress |
| lbf·s/in² | lbf·s/in² | 6894.76 | Mech stress |
| m²/s | m²/s | 1 | SI kinematic |
| ft²/s | ft²/s | 0.09290304 | Imperial kinematic |
| Stokes | St | 1e-4 | CGS kinematic |
Examples
- 0.001 Pa·s → P: 0.001 / 0.1 = 0.01 P
- 1 St → m²/s: 1×10⁻⁴ m²/s
- 10 lb/(ft·s) → Pa·s: 10×1.488164 = 14.88164 Pa·s
Frequently Asked Questions
What’s dynamic vs kinematic?
Dynamic is force per area per velocity, kinematic is dynamic/ density (flow of area/time).
When to use which?
Dynamic for fluid resistance; kinematic for diffusion and mixing rates.
Where get factors?
Standards: ISO, CGS tables, NIST.