Convert Square inches per second to Square feet per hour
Convert Square inches per second (in²/s) to Square feet per hour (ft²/h) instantly and accurately.
Conversion Formula
ft²/h = in²/s × 25
About Square inches per second
The square inch per second (in²/s) equals 6.4516 × 10⁻⁴ m²/s, used in high-speed thermal analyses such as ballistic impact heating, explosive detonation studies, and rapid induction heating of steel billets. Values for high-conductivity copper alloys reach ≈1-2 in²/s; for mild steel ≈0.3 in²/s. 1 in²/s = 0.00064516 m²/s = 3600 in²/h.
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.
Quick Reference Table
| Square inches per second (in²/s) | Square feet per hour (ft²/h) |
|---|---|
| 1 in²/s | 25 ft²/h |
| 2 in²/s | 50 ft²/h |
| 5 in²/s | 125 ft²/h |
| 10 in²/s | 250 ft²/h |
| 25 in²/s | 625 ft²/h |
| 50 in²/s | 1250 ft²/h |
| 100 in²/s | 2500 ft²/h |