Convert Square feet per hour to Square millimetres per minute
Convert Square feet per hour (ft²/h) to Square millimetres per minute (mm²/min) instantly and accurately.
Conversion Formula
mm²/min = ft²/h × 1548.384
About Square feet per hour
The square foot per hour (ft²/h) equals ≈2.581 × 10⁻⁵ m²/s and is the dominant unit in US engineering practice for thermal diffusivity of building materials and industrial insulation. ASHRAE handbooks, Perry's Chemical Engineers' Handbook, and NFPA fire-resistance tables all list diffusivity in ft²/h. Steel: ≈0.4-0.5 ft²/h; concrete: ≈0.023 ft²/h; mineral wool: ≈0.005 ft²/h. 1 ft²/h = 0.09290304/3600 m²/s.
About Square millimetres per minute
The square millimetre per minute (mm²/min) equals 1/60 000 000 m²/s. It appears in material testing standards where thermal diffusivity of polymers and composites is measured over minute-scale heating pulses. ASTM and ISO laser-flash methods sometimes report in mm²/min as an intermediate step. 1 mm²/min = 1e-6/60 m²/s ≈ 1.667 × 10⁻¸ m²/s.
Quick Reference Table
| Square feet per hour (ft²/h) | Square millimetres per minute (mm²/min) |
|---|---|
| 1 ft²/h | 1548.38 mm²/min |
| 2 ft²/h | 3096.77 mm²/min |
| 5 ft²/h | 7741.92 mm²/min |
| 10 ft²/h | 15483.8 mm²/min |
| 25 ft²/h | 38709.6 mm²/min |
| 50 ft²/h | 77419.2 mm²/min |
| 100 ft²/h | 154838 mm²/min |