Convert Square centimetres per hour to Square millimetres per second
Convert Square centimetres per hour (cm²/h) to Square millimetres per second (mm²/s) instantly and accurately.
Conversion Formula
mm²/s = cm²/h × 0.02777777778
About Square centimetres per hour
The square centimetre per hour (cm²/h) equals 1/36 000 000 m²/s. Environmental geophysicists use cm²/h when measuring heat flow in sedimentary rock columns or permafrost layers. Granite has a diffusivity of ≈36 cm²/h; dry sand ≈9 cm²/h. 1 cm²/h = 1e-4/3600 m²/s ≈ 2.778 × 10⁻⁸ 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 centimetres per hour (cm²/h) | Square millimetres per second (mm²/s) |
|---|---|
| 1 cm²/h | 0.0277778 mm²/s |
| 2 cm²/h | 0.0555556 mm²/s |
| 5 cm²/h | 0.138889 mm²/s |
| 10 cm²/h | 0.277778 mm²/s |
| 25 cm²/h | 0.694444 mm²/s |
| 50 cm²/h | 1.38889 mm²/s |
| 100 cm²/h | 2.77778 mm²/s |