Convert Poises to Pounds per inch-second

Convert Poises (P) to Pounds per inch-second (lb/(in·s)) instantly and accurately.

Poises (P)
Pounds per inch-second (lb/(in·s))

Conversion Formula

lb/(in·s) = P × 0.005599741459

About Poises

The poise (P) equals 0.1 Pa·s (exact), defined in the CGS system as 1 g/(cm·s). Named after Jean Louis Marie Poiseuille, it was the dominant viscosity unit before SI adoption. Fluid-mechanics textbooks and older ASTM and API data tables still list viscosities in P. Motor oil at 100 °C is ≈0.02-0.05 P; water at 20 °C is ≈0.01 P (= 1 cP). 1 P = 0.1 Pa·s = 100 cP.

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

Poises (P)Pounds per inch-second (lb/(in·s))
1 P0.00559974 lb/(in·s)
2 P0.0111995 lb/(in·s)
5 P0.0279987 lb/(in·s)
10 P0.0559974 lb/(in·s)
25 P0.139994 lb/(in·s)
50 P0.279987 lb/(in·s)
100 P0.559974 lb/(in·s)

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