Convert Pounds per square foot per hour to Pounds per square foot per second
Convert Pounds per square foot per hour (lb/(ft²·h)) to Pounds per square foot per second (lb/(ft²·s)) instantly and accurately.
Conversion Formula
lb/(ft²·s) = lb/(ft²·h) × 0.0002777777778
About Pounds per square foot per hour
The pound per square foot per hour (lb/(ft²·h)) equals 0.45359237/(0.09290304 × 3600) ≈ 1.356 × 10⁻³ kg/(m²·s). It is used in US heat and mass transfer texts (e.g., Perry's Chemical Engineers' Handbook) for mass flux through surfaces in drying, absorption, and distillation operations using consistent BTU-lb-h units. 1 lb/(ft²·h) ≈ 1.356 g/(m²·s).
About Pounds per square foot per second
The pound per square foot per second (lb/(ft²·s)) equals 0.45359237/0.09290304 ≈ 4.882 kg/(m²·s). It is the coherent FPS mass flux unit, used in US aerospace for rocket motor mass flux, ballistic studies, and hypervelocity heat-shield ablation rate specifications. 1 lb/(ft²·s) ≈ 4.882 kg/(m²·s).
Quick Reference Table
| Pounds per square foot per hour (lb/(ft²·h)) | Pounds per square foot per second (lb/(ft²·s)) |
|---|---|
| 1 lb/(ft²·h) | 0.000277778 lb/(ft²·s) |
| 2 lb/(ft²·h) | 0.000555556 lb/(ft²·s) |
| 5 lb/(ft²·h) | 0.00138889 lb/(ft²·s) |
| 10 lb/(ft²·h) | 0.00277778 lb/(ft²·s) |
| 25 lb/(ft²·h) | 0.00694444 lb/(ft²·s) |
| 50 lb/(ft²·h) | 0.0138889 lb/(ft²·s) |
| 100 lb/(ft²·h) | 0.0277778 lb/(ft²·s) |