🌊 Fluid Mechanics & Lubrication
Kinematic Viscosity Unit Converter
Convert kinematic viscosity ($\nu = \mu / \rho$) across Centistokes ($\text{cSt}$), Stokes ($\text{St}$), $\text{m}^2/\text{s}$, $\text{ft}^2/\text{s}$, and Saybolt Universal Seconds ($\text{SUS}$).
💧 Water (1.004 cSt)
⛽ Kerosene (2.2 cSt)
🚜 ISO VG 46 Oil (46 cSt)
🫒 Olive Oil (80 cSt)
⚙️ Heavy Gear Oil (300 cSt)
Input Value & Unit
Standard Centistokes (cSt)
46.00 cSt
Stokes (St)
0.4600 St
ft² / s
4.951 × 10⁻⁴
Saybolt (SUS)
215.1 SUS
💡 Kinematic vs Dynamic Conversion:
$$\nu = \frac{\mu}{\rho} \implies 1\text{ cSt} = 1\text{ mm}^2/\text{s} = 10^{-6}\text{ m}^2/\text{s} = 0.01\text{ Stokes}$$
Understanding Kinematic Viscosity
Kinematic viscosity ($\nu$) represents the ratio of dynamic viscosity to fluid density ($\nu = \mu / \rho$), characterizing the diffusion of momentum:
- SI Unit: $1\text{ m}^2/\text{s} = 10^4\text{ Stokes} = 10^6\text{ Centistokes (cSt)}$.
- Standard Lubrication Unit: Industrial lubricant grades (e.g., ISO VG 32, ISO VG 46, ISO VG 68) specify kinematic viscosity in $\text{cSt}$ at $40^\circ\text{C}$.
- ASTM D2161 Saybolt Conversion: For $\nu > 100\text{ cSt}$, $\text{SUS} \approx 4.635 \times \nu_{\text{cSt}}$.