Convert Pounds per square foot per hour to Kilograms per square metre per second
Convert Pounds per square foot per hour (lb/(ft²·h)) to Kilograms per square metre per second (kg/(m²·s)) instantly and accurately.
Conversion Formula
kg/(m²·s) = lb/(ft²·h) × 0.001356229899
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 Kilograms per square metre per second
The kilogram per square metre per second (kg/(m²·s)) is the SI coherent unit of mass flux density, equal to 1 kg·m⁻²·s⁻¹. It appears directly in the continuity equation (ṁ = ρv) and in Stefan's law for evaporation. Rocket nozzle throat mass flux can reach 500-2000 kg/(m²·s); convective heat exchangers: 100-500 kg/(m²·s). 1 kg/(m²·s) = 1 000 g/(m²·s).
Quick Reference Table
| Pounds per square foot per hour (lb/(ft²·h)) | Kilograms per square metre per second (kg/(m²·s)) |
|---|---|
| 1 lb/(ft²·h) | 0.00135623 kg/(m²·s) |
| 2 lb/(ft²·h) | 0.00271246 kg/(m²·s) |
| 5 lb/(ft²·h) | 0.00678115 kg/(m²·s) |
| 10 lb/(ft²·h) | 0.0135623 kg/(m²·s) |
| 25 lb/(ft²·h) | 0.0339057 kg/(m²·s) |
| 50 lb/(ft²·h) | 0.0678115 kg/(m²·s) |
| 100 lb/(ft²·h) | 0.135623 kg/(m²·s) |