User:Milton Beychok/Sandbox2: Difference between revisions

Latest revision as of 04:25, 22 November 2023

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-The '''pound-force''' (symbol: '''lbf''' from the Latin ''libra'' for [[Pound (mass)|pound]] and the symbol ''f'' for [[force]]) is a [[measurement]]|unit of force used primarily in the [[United States]].   It is equivalent to exactly 4.4482216152605 [[newton]]s. In most contexts, the shorter name '''"pound"''' is used, but this can introduce confusion with the [[pound (mass)|mass unit of the similar name]].
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-== Definitions ==
-The pound-force is equal to the gravitational force exerted on a mass of one [[Pound_(mass)#Avoirdupois_pound|avoirdupois pound]] on the surface of [[Earth]]. Since the 18th century, the unit has been used in low-precision measurements, for which small changes in [[gravity (Earth)|Earth's gravity]] (which varies from place to place by up to half a percent) can safely be neglected.
-The 20th century, however, brought the need for a more precise definition. A standardized value for acceleration due to gravity was therefore needed.  Today, in accordance with the [[General Conference on Weights and Measures]], [[standard gravity]] is usually taken to be 9.80665&nbsp;m/s<sup>2</sup> (32.174 049&nbsp;ft/s<sup>2</sup>).