Convert Poises to Pounds per foot-hour
Convert Poises (P) to Pounds per foot-hour (lb/(ft·h)) instantly and accurately.
Conversion Formula
lb/(ft·h) = P × 241.9088311
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.
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.
Quick Reference Table
| Poises (P) | Pounds per foot-hour (lb/(ft·h)) |
|---|---|
| 1 P | 241.909 lb/(ft·h) |
| 2 P | 483.818 lb/(ft·h) |
| 5 P | 1209.54 lb/(ft·h) |
| 10 P | 2419.09 lb/(ft·h) |
| 25 P | 6047.72 lb/(ft·h) |
| 50 P | 12095.4 lb/(ft·h) |
| 100 P | 24190.9 lb/(ft·h) |