Convert Square millimetres per hour to Square inches per minute
Convert Square millimetres per hour (mm²/h) to Square inches per minute (in²/min) instantly and accurately.
Conversion Formula
in²/min = mm²/h × 2.583338500e-5
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 minute
The square inch per minute (in²/min) equals ≈1.075 × 10⁻⁵ m²/s, found in US military and aerospace specifications for thermal protection materials and ablative heat shields. Some NASA technical reports on reentry vehicle TPS (Thermal Protection System) materials quote diffusivity in in²/min. 1 in²/min = 0.00064516/60 m²/s.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Square inches per minute (in²/min) |
|---|---|
| 1 mm²/h | 2.583 × 10-5 in²/min |
| 2 mm²/h | 5.167 × 10-5 in²/min |
| 5 mm²/h | 0.000129167 in²/min |
| 10 mm²/h | 0.000258334 in²/min |
| 25 mm²/h | 0.000645835 in²/min |
| 50 mm²/h | 0.00129167 in²/min |
| 100 mm²/h | 0.00258334 in²/min |