Convert Square feet per minute to Square millimetres per hour
Convert Square feet per minute (ft²/min) to Square millimetres per hour (mm²/h) instantly and accurately.
Conversion Formula
mm²/h = ft²/min × 5574182.4
About Square feet per minute
The square foot per minute (ft²/min) equals ≈1.548 × 10⁻³ m²/s, an uncommon transitional unit appearing in some older US industrial furnace design charts and heat-treatment process sheets where holding times are expressed in minutes. 1 ft²/min = 60 ft²/h = 0.09290304/60 m²/s ≈1.548 × 10⁻³ 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 feet per minute (ft²/min) | Square millimetres per hour (mm²/h) |
|---|---|
| 1 ft²/min | 5574180 mm²/h |
| 2 ft²/min | 11148400 mm²/h |
| 5 ft²/min | 27870900 mm²/h |
| 10 ft²/min | 55741800 mm²/h |
| 25 ft²/min | 139355000 mm²/h |
| 50 ft²/min | 278709000 mm²/h |
| 100 ft²/min | 557418000 mm²/h |