Convert Square feet per hour to Square decimetres per second
Convert Square feet per hour (ft²/h) to Square decimetres per second (dm²/s) instantly and accurately.
Conversion Formula
dm²/s = ft²/h × 0.00258064
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 decimetres per second
The square decimetre per second (dm²/s) equals exactly 0.01 m²/s, a rarely used but exact-ratio metric unit. It is occasionally encountered in European academic papers on molten metals and liquid semiconductors, where diffusivity values in m²/s are small fractions and dm²/s gives more convenient numeric magnitudes. 1 dm²/s = 1e-2 m²/s = 100 cm²/s.
Quick Reference Table
| Square feet per hour (ft²/h) | Square decimetres per second (dm²/s) |
|---|---|
| 1 ft²/h | 0.00258064 dm²/s |
| 2 ft²/h | 0.00516128 dm²/s |
| 5 ft²/h | 0.0129032 dm²/s |
| 10 ft²/h | 0.0258064 dm²/s |
| 25 ft²/h | 0.064516 dm²/s |
| 50 ft²/h | 0.129032 dm²/s |
| 100 ft²/h | 0.258064 dm²/s |