Convert Slugs per foot-second to Pound-force seconds per square inch
Convert Slugs per foot-second (slug/(ft·s)) to Pound-force seconds per square inch (lbf·s/in²) instantly and accurately.
Conversion Formula
lbf·s/in² = slug/(ft·s) × 0.006944444444
About Slugs per foot-second
The slug per foot-second (slug/(ft·s)) equals 1 lbf·s/ft² ≈ 47.880 Pa·s, the coherent FPS viscosity unit where force is in pound-force. It is used in US aerospace and hydraulic engineering when working with the slug as the unit of mass. Water at 20 °C has a viscosity of ≈2.09×10⁻⁵ slug/(ft·s); hydraulic fluid MIL-PRF-5606 is ≈3×10⁻⁴ slug/(ft·s) at 100 °F. 1 slug/(ft·s) ≈ 47.880 Pa·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
| Slugs per foot-second (slug/(ft·s)) | Pound-force seconds per square inch (lbf·s/in²) |
|---|---|
| 1 slug/(ft·s) | 0.00694444 lbf·s/in² |
| 2 slug/(ft·s) | 0.0138889 lbf·s/in² |
| 5 slug/(ft·s) | 0.0347222 lbf·s/in² |
| 10 slug/(ft·s) | 0.0694444 lbf·s/in² |
| 25 slug/(ft·s) | 0.173611 lbf·s/in² |
| 50 slug/(ft·s) | 0.347222 lbf·s/in² |
| 100 slug/(ft·s) | 0.694444 lbf·s/in² |