Convert Square feet per hour to Square millimetres per hour
Convert Square feet per hour (ft²/h) to Square millimetres per hour (mm²/h) instantly and accurately.
Conversion Formula
mm²/h = ft²/h × 92903.04
About Square feet per hour
The square foot per hour (ft²/h) equals 0.3048²/3600 ≈ 2.581 × 10⁻⁵ m²/s. It is the standard US unit for thermal diffusivity in the BTU-ft-h system, used alongside heat-transfer and mass-transfer calculations. Air at 20 °C ≈ 0.573 ft²/h; water at 20 °C ≈ 0.0096 ft²/h. 1 ft²/h ≈ 25.81 cSt.
About Square millimetres per hour
The square millimetre per hour (mm²/h) equals 1/(3.6 × 10⁹) m²/s ≈ 2.78 × 10⁻¹⁰ m²/s. It appears in materials science for solid-state diffusion and thin-film growth studies where hourly timescales are more natural than seconds. 1 mm²/h = 1/3600 mm²/s = 1/3600 cSt.
Quick Reference Table
| Square feet per hour (ft²/h) | Square millimetres per hour (mm²/h) |
|---|---|
| 1 ft²/h | 92903 mm²/h |
| 2 ft²/h | 185806 mm²/h |
| 5 ft²/h | 464515 mm²/h |
| 10 ft²/h | 929030 mm²/h |
| 25 ft²/h | 2322580 mm²/h |
| 50 ft²/h | 4645150 mm²/h |
| 100 ft²/h | 9290300 mm²/h |