Convert Square millimetres per hour to Square centimetres per second
Convert Square millimetres per hour (mm²/h) to Square centimetres per second (cm²/s) instantly and accurately.
Conversion Formula
cm²/s = mm²/h × 2.777777778e-6
About Square millimetres per hour
The square millimetre per hour (mm²/h) equals 1/3 600 000 000 m²/s, the smallest practical thermal diffusivity unit. It is used in very slow heat-transfer processes such as diffusion through frozen soils or phase-change materials studied over many hours. Heavy clay soils can show diffusivity values of 1-2 mm²/h. 1 mm²/h = 1e-6/3600 m²/s.
About Square centimetres per second
The square centimetre per second (cm²/s) equals 1 × 10⁻⁴ m²/s and is the CGS unit for thermal diffusivity, sometimes called the stokes by analogy with kinematic viscosity. Pre-SI thermophysics literature and many older reference databases list values in cm²/s: iron ≈0.18 cm²/s; aluminium ≈0.84 cm²/s; water ≈1.4 × 10⁻³ cm²/s. 1 cm²/s = 1 × 10⁻⁴ m²/s.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Square centimetres per second (cm²/s) |
|---|---|
| 1 mm²/h | 2.778 × 10-6 cm²/s |
| 2 mm²/h | 5.556 × 10-6 cm²/s |
| 5 mm²/h | 1.389 × 10-5 cm²/s |
| 10 mm²/h | 2.778 × 10-5 cm²/s |
| 25 mm²/h | 6.944 × 10-5 cm²/s |
| 50 mm²/h | 0.000138889 cm²/s |
| 100 mm²/h | 0.000277778 cm²/s |