Convert Pounds per inch-second to Slugs per foot-second
Convert Pounds per inch-second (lb/(in·s)) to Slugs per foot-second (slug/(ft·s)) instantly and accurately.
Conversion Formula
slug/(ft·s) = 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 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.
Quick Reference Table
| Pounds per inch-second (lb/(in·s)) | Slugs per foot-second (slug/(ft·s)) |
|---|---|
| 1 lb/(in·s) | 0.372971 slug/(ft·s) |
| 2 lb/(in·s) | 0.745943 slug/(ft·s) |
| 5 lb/(in·s) | 1.86486 slug/(ft·s) |
| 10 lb/(in·s) | 3.72971 slug/(ft·s) |
| 25 lb/(in·s) | 9.32429 slug/(ft·s) |
| 50 lb/(in·s) | 18.6486 slug/(ft·s) |
| 100 lb/(in·s) | 37.2971 slug/(ft·s) |