Convert Square millimetres per hour to Square feet per second
Convert Square millimetres per hour (mm²/h) to Square feet per second (ft²/s) instantly and accurately.
Conversion Formula
ft²/s = mm²/h × 2.989975116e-9
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.
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.
Quick Reference Table
| Square millimetres per hour (mm²/h) | Square feet per second (ft²/s) |
|---|---|
| 1 mm²/h | 2.99 × 10-9 ft²/s |
| 2 mm²/h | 5.98 × 10-9 ft²/s |
| 5 mm²/h | 1.495 × 10-8 ft²/s |
| 10 mm²/h | 2.99 × 10-8 ft²/s |
| 25 mm²/h | 7.475 × 10-8 ft²/s |
| 50 mm²/h | 1.495 × 10-7 ft²/s |
| 100 mm²/h | 2.99 × 10-7 ft²/s |