A pound or pound-force (abbreviations: lb, lbf, or lbf) is a
unit of
force. Pound is also the name of a
unit of mass. One pound-force is approximately equal to the gravitational force exerted on a mass of one
avoirdupois pound on the surface of
Earth.The standard
acceleration due to Earth's gravity is usually taken to be 9.80665 m/s² (approximately 32.174 05 ft/s²) today, but other values have been used, including 32.16 ft/s² (approximately 9.80237 m/s²). The actual acceleration due to
Earth's gravity varies from place to place, in general increasing from the equator (9.78 m/s²) to the poles (9.83 m/s²).
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