Convert Square feet per second to Square millimetres per hour
Convert Square feet per second (ft²/s) to Square millimetres per hour (mm²/h) instantly and accurately.
Conversion Formula
mm²/h = ft²/s × 334450944
About Square feet per second
The square foot per second (ft²/s) equals 0.3048² = 0.09290304 m²/s. It is the coherent FPS kinematic viscosity unit, used in US aerospace, hydraulic machinery, and civil/coastal engineering. Water at 20 °C ≈ 1.082 × 10⁻⁵ ft²/s; air at 20 °C ≈ 1.632 × 10⁻⁴ ft²/s. 1 ft²/s ≈ 92903 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 second (ft²/s) | Square millimetres per hour (mm²/h) |
|---|---|
| 1 ft²/s | 334451000 mm²/h |
| 2 ft²/s | 668902000 mm²/h |
| 5 ft²/s | 1.672 × 109 mm²/h |
| 10 ft²/s | 3.345 × 109 mm²/h |
| 25 ft²/s | 8.361 × 109 mm²/h |
| 50 ft²/s | 1.672 × 1010 mm²/h |
| 100 ft²/s | 3.345 × 1010 mm²/h |