Poundal (pdl)
The poundal (pdl) is a unit of force in the foot-pound-second (FPS) system of measurement. It is defined as the force required to accelerate a one-pound mass by one foot per second squared. In other words,
1 poundal = 1 lb × 1 ft/s².
The poundal is much smaller than the more commonly used pound-force (lbf). It’s mainly used in some engineering contexts and classical mechanics problems where the FPS system is preferred. However, it is less common than the SI unit of force, the newton.
Conversion:
1 poundal ≈ 0.13825 newtons.
It looks like you mentioned "pound-force square second per foot". This is a compound unit that can be broken down into:
pound-force (lbf): a unit of force
square second (s²): time squared
per foot (ft⁻¹): per unit length
What does this unit represent?
It could be a unit for something like mass or inertia-related quantities in imperial units, depending on context. For example, it might show up in equations involving force, time, and length — possibly in mechanics or engineering.
To understand or convert it:
Pound-force (lbf) is a force unit, where:
1lbf=4.44822N
Second squared (s²) is just time squared.
Foot (ft) is length:
1ft=0.3048m
Example usage
If you want to convert pound-force square second per foot (lbf⋅s2/ft) into SI units:
lbf⋅s2/ft→Newton⋅s2/meter
Since
1lbf=4.44822N,1ft=0.3048m
1ftlbf⋅s2=0.3048m4.44822N⋅s2≈14.6mN⋅s2
Could you tell me more about where or how you want to use this unit? That would help me give a more specific explanation or conversion!