Convert Pounds per inch-second to Pound-force seconds per square foot
Convert Pounds per inch-second (lb/(in·s)) to Pound-force seconds per square foot (lbf·s/ft²) instantly and accurately.
Conversion Formula
lbf·s/ft² = lb/(in·s) × 0.3729714021
About Pounds per inch-second
The pound per inch-second (lb/(in·s)) equals 0.45359237/0.0254 ≈ 17.858 Pa·s, used in plastics extrusion and rubber compounding industries where inch-based dimensions are combined with mass-based flow analysis. Polymer melt viscosities at processing temperatures are sometimes quoted in lb/(in·s) in older US extrusion equipment manuals. 1 lb/(in·s) ≈ 17.858 Pa·s = 12 lb/(ft·s).
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
| Pounds per inch-second (lb/(in·s)) | Pound-force seconds per square foot (lbf·s/ft²) |
|---|---|
| 1 lb/(in·s) | 0.372971 lbf·s/ft² |
| 2 lb/(in·s) | 0.745943 lbf·s/ft² |
| 5 lb/(in·s) | 1.86486 lbf·s/ft² |
| 10 lb/(in·s) | 3.72971 lbf·s/ft² |
| 25 lb/(in·s) | 9.32429 lbf·s/ft² |
| 50 lb/(in·s) | 18.6486 lbf·s/ft² |
| 100 lb/(in·s) | 37.2971 lbf·s/ft² |