From Simple English Wikipedia, the free encyclopedia

The pound-force, or simply pound (abbreviations: lb, lbf, or lbf), is a unit of force. The pound-force is about equal to the gravitational force applied on a mass of one pound on the surface of Earth. Since the 18th century, the unit has been used in low-precision measurements.

In the 20th century, people needed a more precise definition. An official value for acceleration due to gravity was needed. Today, as decided by the General Conference on Weights and Measures, standard gravity is usually taken to be 9.80665 m/s2 (32.1740 ft/s2).[1]

Related pages[change | change source]

References[change | change source]

  1. "Declaration on the unit of mass and on the definition of weight; conventional value of gn". BIPM: Bureau International des Poids et Mesures. Archived from the original on 2012-02-07. Retrieved 2011-12-12.