# Pound-force

Physical unit
Unit name Pound-force
Unit symbol ${\ displaystyle \ mathrm {lb, lbf, lb_ {f}, lb_ {F}, lb _ {\ mathit {F}}}}$
Physical quantity (s) force
Formula symbol ${\ displaystyle F}$
dimension ${\ displaystyle {\ mathsf {M \; L \; T ^ {- 2}}}}$
system Anglo-American system of measurement
In SI units ${\ displaystyle \ mathrm {1 \, lb_ {f} = 4 {,} 448 \, 221 \, 615 \, 260 \, 5 \; N}}$
Derived from Pound

Pound-force (Engl. Colloquially pound translates force pounds ) is an Anglo-American unit for forces and with lb, lbf or lb f abbreviated. One pound-force corresponds to the force that is exerted on a mass of one English Avoirdupois pound (0.45359237 kg) due to the acceleration of gravity on the earth's surface. Usually the standard acceleration rate g n  = 9.80665 m / s² is used, but sometimes rounded to 32.17405 ft / s² or the like. It follows that a pound-force corresponds to about 4.4482 N.

For pipes and tire pressures according to the US American standard, the compressive strength is specified in psi or lbs , which means pounds per square inch , more precisely pound-force per square inch .

1000 times this unit is sometimes referred to in the USA as kip (from kilo-pound). The unit is mainly used by architects and civil engineers.

## Individual evidence

1. What is a kip? on sizes.com, accessed May 26, 2018