Convert Slugs per foot-second to Pounds per inch-second
Convert Slugs per foot-second (slug/(ft·s)) to Pounds per inch-second (lb/(in·s)) instantly and accurately.
Conversion Formula
lb/(in·s) = slug/(ft·s) × 2.681170713
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 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).
Quick Reference Table
| Slugs per foot-second (slug/(ft·s)) | Pounds per inch-second (lb/(in·s)) |
|---|---|
| 1 slug/(ft·s) | 2.68117 lb/(in·s) |
| 2 slug/(ft·s) | 5.36234 lb/(in·s) |
| 5 slug/(ft·s) | 13.4059 lb/(in·s) |
| 10 slug/(ft·s) | 26.8117 lb/(in·s) |
| 25 slug/(ft·s) | 67.0293 lb/(in·s) |
| 50 slug/(ft·s) | 134.059 lb/(in·s) |
| 100 slug/(ft·s) | 268.117 lb/(in·s) |