Convert Square millimetres per hour to Stokes
Convert Square millimetres per hour (mm²/h) to Stokes (St) instantly and accurately.
Conversion Formula
St = mm²/h × 2.777777778e-6
About Square millimetres per hour
The square millimetre per hour (mm²/h) equals 1/(3.6 × 10⁹) m²/s ≈ 2.78 × 10⁻¹⁰ m²/s. It appears in materials science for solid-state diffusion and thin-film growth studies where hourly timescales are more natural than seconds. 1 mm²/h = 1/3600 mm²/s = 1/3600 cSt.
About Stokes
The stoke (St) equals 1 cm²/s = 10⁻⁴ m²/s, the CGS unit of kinematic viscosity named after Sir George Gabriel Stokes. Its hundredth part, the centistoke, is now dominant, but the stoke still appears in older fluid-mechanics texts and archival API and ASTM data. Water at 20 °C ≈ 0.01004 St; air at 20 °C ≈ 0.1516 St. 1 St = 100 cSt = 10⁻⁴ m²/s.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Stokes (St) |
|---|---|
| 1 mm²/h | 2.778 × 10-6 St |
| 2 mm²/h | 5.556 × 10-6 St |
| 5 mm²/h | 1.389 × 10-5 St |
| 10 mm²/h | 2.778 × 10-5 St |
| 25 mm²/h | 6.944 × 10-5 St |
| 50 mm²/h | 0.000138889 St |
| 100 mm²/h | 0.000277778 St |