Convert Pounds per inch-second to Pound-force seconds per square inch
Convert Pounds per inch-second (lb/(in·s)) to Pound-force seconds per square inch (lbf·s/in²) instantly and accurately.
Conversion Formula
lbf·s/in² = lb/(in·s) × 0.002590079181
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 inch
The pound-force second per square inch (lbf·s/in², reyn) equals 144 × 47.880 ≈ 6 894.8 Pa·s. Informally called the "reyn" (after Osborne Reynolds), it is used in US tribology and bearing-design engineering, where oil-film viscosity in heavily loaded contacts is stated in reyn. Turbine bearing oils at operating temperature range 0.5-3 × 10⁻⁶ reyn. 1 reyn ≈ 6 894.8 Pa·s.
Quick Reference Table
| Pounds per inch-second (lb/(in·s)) | Pound-force seconds per square inch (lbf·s/in²) |
|---|---|
| 1 lb/(in·s) | 0.00259008 lbf·s/in² |
| 2 lb/(in·s) | 0.00518016 lbf·s/in² |
| 5 lb/(in·s) | 0.0129504 lbf·s/in² |
| 10 lb/(in·s) | 0.0259008 lbf·s/in² |
| 25 lb/(in·s) | 0.064752 lbf·s/in² |
| 50 lb/(in·s) | 0.129504 lbf·s/in² |
| 100 lb/(in·s) | 0.259008 lbf·s/in² |