Convert Square millimetres per hour to Square inches per hour
Convert Square millimetres per hour (mm²/h) to Square inches per hour (in²/h) instantly and accurately.
Conversion Formula
in²/h = mm²/h × 0.0015500031
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 inches per hour
The square inch per hour (in²/h) equals ≈1.792 × 10⁻⁷ m²/s, used in US heat-transfer handbooks and HVAC insulation specifications. Pre-SI tables for building insulation board and refractory brick often list thermal diffusivity in in²/h. Firebrick: ≈3.5 in²/h; rigid foam: ≈0.8-1.2 in²/h. 1 in²/h = 0.00064516/3600 m²/s.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Square inches per hour (in²/h) |
|---|---|
| 1 mm²/h | 0.00155 in²/h |
| 2 mm²/h | 0.00310001 in²/h |
| 5 mm²/h | 0.00775002 in²/h |
| 10 mm²/h | 0.0155 in²/h |
| 25 mm²/h | 0.0387501 in²/h |
| 50 mm²/h | 0.0775002 in²/h |
| 100 mm²/h | 0.155 in²/h |