What is being measured?
Kinematic viscosity is dynamic viscosity divided by density under the applicable conditions. Matching dimensions do not make it thermal diffusivity.
cSt and mm²/s are numerically identical but retain familiar labels within one quantity converter.
Meaning of St
Stokes uses the symbol St in this library and measures kinematic viscosity. Under the stated reference convention, 1 St = approximately 0.0001 m²/s. This equivalence changes how a known value is written. It does not increase measurement accuracy or establish whether a measurement is appropriate to a real application.
Conversion method
Multiply the value by the source factor (0.0001), then divide by the target factor (1). The factor ratio expresses the same kinematic viscosity measurement in the other unit.
Worked example
For a known value of 10 St, the reference conversion gives 0.001 m²/s. Converting that result back gives approximately 10 St. This reverse check helps catch a reversed factor, but matching round-trip arithmetic alone does not independently verify a source definition.
Common reference values
| Input (St) | Reference equivalent (m²/s) |
|---|---|
| 1 | 0.0001 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
Compare one St with other units
| Target unit | Equivalent of 1 St | Definition guide |
|---|---|---|
| Square meters per second (m²/s) | 0.0001 | Read definition |
| Square millimeters per second (mm²/s) | 100 | Read definition |
| Square feet per second (ft²/s) | 0.00107639104167 | Read definition |
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Use a working converter
- Kinematic viscosity converter
- Stokes to Square meters per second converter (kinematic viscosity)
- Stokes to Centistokes converter (kinematic viscosity)
- Stokes to Square millimeters per second converter (kinematic viscosity)
- Stokes to Square feet per second converter (kinematic viscosity)
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.