The centistoke (cSt) is the most commonly used unit of kinematic viscosity in industry, equal to 10⁻² St or 10⁻⁶ m²/s. Water at 20°C has a kinematic viscosity of approximately 1 cSt. Motor oil grades (e.g., SAE 10W-30) are defined by their viscosity in centistokes.
Stokes
The stokes (St) is the CGS unit of kinematic viscosity, named after Sir George Gabriel Stokes. One stokes equals one square centimetre per second (1 cm²/s = 10⁻⁴ m²/s). Water at 20°C has a kinematic viscosity of about 0.01 St (1 centistoke).
Centistokes to Stokes conversion table
Centistokes
Stokes
1
0.01
2
0.02
5
0.05
10
0.1
25
0.25
50
0.5
100
1
500
5
1000
10
Most common viscosity - kinematic unit conversions
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