Convert Square metres per hour to Square millimetres per second
Convert Square metres per hour (m²/h) to Square millimetres per second (mm²/s) instantly and accurately.
Conversion Formula
mm²/s = m²/h × 277.7777778
About Square metres per hour
The square metre per hour (m²/h) equals 1/3600 m²/s ≈2.778 × 10⁻⁴ m²/s, used in large-scale geotechnical and civil engineering analyses. Soil consolidation models and groundwater thermal plume simulations often use m²/h because the full diffusion process unfolds over hours to days. 1 m²/h = 10 000 cm²/h ≈ 2.778 × 10⁻⁴ m²/s.
About Square millimetres per second
The square millimetre per second (mm²/s) equals 1 × 10⁻⁶ m²/s and is the standard unit in materials engineering and the laser-flash diffusivity method (ASTM E1461, ISO 22007-4). Metals span roughly 2-180 mm²/s; polymers 0.07-0.2 mm²/s; ceramics 0.3-10 mm²/s. Numerically identical to the kinematic viscosity unit (cSt) in SI context. 1 mm²/s = 1 × 10⁻⁶ m²/s.
Quick Reference Table
| Square metres per hour (m²/h) | Square millimetres per second (mm²/s) |
|---|---|
| 1 m²/h | 277.778 mm²/s |
| 2 m²/h | 555.556 mm²/s |
| 5 m²/h | 1388.89 mm²/s |
| 10 m²/h | 2777.78 mm²/s |
| 25 m²/h | 6944.44 mm²/s |
| 50 m²/h | 13888.9 mm²/s |
| 100 m²/h | 27777.8 mm²/s |