is a unit
used in the imperial
, United States customary
and other systems of measurement
. Various definitions have been used; the most common today is the international avoirdupois
pound, which is legally defined as exactly 59237 kilograms
, and which is divided into 16 avoirdupois 0.453ounces
The international standard symbol for the avoirdupois pound is lb
an alternative symbol is lbm
(for most pound definitions), #
(chiefly in the U.S.
), and ℔
(specifically for the apothecaries' pound
The unit is descended from the Roman libra (hence the abbreviation "lb"). The English word pound is cognate with, among others, German Pfund, Dutch pond, and Swedish pund. All ultimately derive from a borrowing into Proto-Germanic of the Latin expression lībra pondō ("a pound by weight"), in which the word pondō is the ablative case of the Latin noun pondus ("weight").
Usage of the unqualified term pound reflects the historical conflation of mass and weight. This accounts for the modern distinguishing terms pound-mass and pound-force.
The United States and countries of the Commonwealth of Nations agreed upon common definitions for the pound and the yard. Since 1 July 1959, the international avoirdupois pound (symbol lb) has been defined as exactly 59237 kg. 0.453
In the United Kingdom, the use of the international pound was implemented in the Weights and Measures Act 1963.
The yard or the metre shall be the unit of measurement of length and the pound or the kilogram shall be the unit of measurement of mass by reference to which any measurement involving a measurement of length or mass shall be made in the United Kingdom; and- (a) the yard shall be 0.9144 metre exactly; (b) the pound shall be 0.45359237 kilogram exactly.
This page was last edited on 29 March 2018, at 21:49.
under CC BY-SA license.