Convert Square inches per minute to Square millimetres per hour
Convert Square inches per minute (in²/min) to Square millimetres per hour (mm²/h) instantly and accurately.
Conversion Formula
mm²/h = in²/min × 38709.6
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.
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.
Quick Reference Table
| Square inches per minute (in²/min) | Square millimetres per hour (mm²/h) |
|---|---|
| 1 in²/min | 38709.6 mm²/h |
| 2 in²/min | 77419.2 mm²/h |
| 5 in²/min | 193548 mm²/h |
| 10 in²/min | 387096 mm²/h |
| 25 in²/min | 967740 mm²/h |
| 50 in²/min | 1935480 mm²/h |
| 100 in²/min | 3870960 mm²/h |