Convert Poises to Pound-force seconds per square foot
Convert Poises (P) to Pound-force seconds per square foot (lbf·s/ft²) instantly and accurately.
Conversion Formula
lbf·s/ft² = P × 0.002088543423
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 Pound-force seconds per square foot
The pound-force second per square foot (lbf·s/ft²) equals (9.80665 × 0.45359237) / 0.3048² ≈ 47.880 Pa·s, numerically identical to slug/(ft·s). It appears in US civil and structural engineering fluid mechanics, pump hydraulics texts, and older API pipeline standards. A key identity: 1 lbf·s/ft² = 1 slug/(ft·s) ≈ 47.880 Pa·s = 478.8 P.
Quick Reference Table
| Poises (P) | Pound-force seconds per square foot (lbf·s/ft²) |
|---|---|
| 1 P | 0.00208854 lbf·s/ft² |
| 2 P | 0.00417709 lbf·s/ft² |
| 5 P | 0.0104427 lbf·s/ft² |
| 10 P | 0.0208854 lbf·s/ft² |
| 25 P | 0.0522136 lbf·s/ft² |
| 50 P | 0.104427 lbf·s/ft² |
| 100 P | 0.208854 lbf·s/ft² |