Convert Pounds per foot-hour to Poises
Convert Pounds per foot-hour (lb/(ft·h)) to Poises (P) instantly and accurately.
Conversion Formula
P = lb/(ft·h) × 0.004133788732
About Pounds per foot-hour
The pound per foot-hour (lb/(ft·h)) equals 0.45359237 / (0.3048 × 3600) ≈ 4.134×10⁻⁴ Pa·s. It appears in US heat-transfer and mass-transfer textbooks (e.g., McCabe, Smith & Harriott) where viscosity enters the Reynolds number using consistent hour-based units alongside BTU, ft, and lb quantities. Water at 20 °C is ≈2.42 lb/(ft·h). 1 lb/(ft·h) ≈ 4.134×10⁻⁴ Pa·s.
About Poises
The poise (P) equals 0.1 Pa·s (exact), defined in the CGS system as 1 g/(cm·s). Named after Jean Louis Marie Poiseuille, it was the dominant viscosity unit before SI adoption. Fluid-mechanics textbooks and older ASTM and API data tables still list viscosities in P. Motor oil at 100 °C is ≈0.02-0.05 P; water at 20 °C is ≈0.01 P (= 1 cP). 1 P = 0.1 Pa·s = 100 cP.
Quick Reference Table
| Pounds per foot-hour (lb/(ft·h)) | Poises (P) |
|---|---|
| 1 lb/(ft·h) | 0.00413379 P |
| 2 lb/(ft·h) | 0.00826758 P |
| 5 lb/(ft·h) | 0.0206689 P |
| 10 lb/(ft·h) | 0.0413379 P |
| 25 lb/(ft·h) | 0.103345 P |
| 50 lb/(ft·h) | 0.206689 P |
| 100 lb/(ft·h) | 0.413379 P |