Convert Square millimetres per hour to Square millimetres per second
Convert Square millimetres per hour (mm²/h) to Square millimetres per second (mm²/s) instantly and accurately.
Conversion Formula
mm²/s = mm²/h × 0.0002777777778
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 Square millimetres per second
The square millimetre per second (mm²/s) equals 10⁻⁶ m²/s, numerically identical to 1 centistoke (cSt). It is the preferred SI-consistent expression: ISO 3104, DIN 51562, and ASTM viscosity standards all use mm²/s interchangeably with cSt. Water at 20 °C ≈ 1.004 mm²/s; SAE 10W-30 at 100 °C: 9.3-12.5 mm²/s. 1 mm²/s = 1 cSt.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Square millimetres per second (mm²/s) |
|---|---|
| 1 mm²/h | 0.000277778 mm²/s |
| 2 mm²/h | 0.000555556 mm²/s |
| 5 mm²/h | 0.00138889 mm²/s |
| 10 mm²/h | 0.00277778 mm²/s |
| 25 mm²/h | 0.00694444 mm²/s |
| 50 mm²/h | 0.0138889 mm²/s |
| 100 mm²/h | 0.0277778 mm²/s |