Diferenzas entre revisións de «Libra (masa)»

(Arranxos)
 
== A libra como patrón monetario ==
A primeira emisión de [[Moeda (peza metálica)|moeda]] en Roma, efectuada no [[Século -IV|século IV]] a. C., foi o ''As Libral'', cuxo peso estaba baseado no da '''libra''' grega, e era de 327,4 [[Gramo|gramos]] de prata.<ref name="zupko">{{cite book|last=Zupko|first=Ronald Edward|author-link=Ronald Edward Zupko|title=Dictionary of Weights and Measures for the British Isles: The Middle Ages to the 20th Century|publisher=DIANE Publishing|isbn=0-87169-168-X|date=1985-12-01}}</ref> O resto de [[Moeda (peza metálica)|moedas]] emitidas ao longo da súa historia, tales como os [[Denario|denarios]] e [[Sestercio|sestercios]], estaban baseadas en divisores deste patrón monetario.<ref name="tracthille">{{Citationcite journal|editor-last=RuffheadHille|editor-first=OwenK.C.|editortitle=Medicinal-link=Owen RuffheadGewicht|titlepage=The Statutes at Large268|url=https://books.google.com/books?id=tKZFAAAAcAAJBfI3AAAAMAAJ&pg=RA2-PA268|volumejournal=Vol.&nbsp;I:Magazin Fromfür MagnaPharmacie Charta<!--sic-->und todie thedahin Endeinschlagenden of the Reign of King Henry the Sixth. To which is prefixed, A Table of the Titles of all the Publick and Private Statutes during that TimeWissenschaften|locationyear=London1831|publisherlocation=Mark Basket for the Crown|date=1763a|pp=[https://books.google.com/books?id=tKZFAAAAcAAJ&pg=PA148 148–149]}}. {{en icon}}&nbsp;& {{la icon}}&nbsp;& {{nrf iconHeidelberg}}</ref>
 
No ano 800 [[Carlomagno]] adoptou a '''libra '''de 489,6 gramos divisible en 2 marcos.<ref name="NGS2">{{cite web|url=http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf|author=United States National Bureau of Standards|title=Notices "Refinement of values for the yard and the pound"|date=1959-06-25|accessdate=2006-08-12}}</ref> Utilizouse como patrón para a medida das moedas, estabelecéndose que cada libra equivalía a 20 soldos ou a 240 diñeiros.<ref name="NGS">{{cite web|url=http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf|author=United States National Bureau of Standards|title=Notices "Refinement of values for the yard and the pound"|date=1959-06-25|accessdate=2006-08-12}}</ref>
 
Soamente existía o diñeiro como moeda real.<ref name="hille">{{cite journal|last=Hille|first=K.C.|title=Medicinal-Gewicht|page=268|url=https://books.google.com/books?id=BfI3AAAAMAAJ&pg=RA2-PA268|journal=Magazin für Pharmacie und die dahin einschlagenden Wissenschaften|year=1831|location=Heidelberg}}</ref> Os soldos, marcos e libras eran unidades de conta.<ref>{{cite book|author=Cardarelli, F.|year=2004|title=Encyclopaedia of Scientific Units, Weights and Measures: Their SI Equivalences and Origins|publisher=Springer|edition=2nd|page=122|isbn=1-85233-682-X|url=https://books.google.com/books?id=6KCx8Ww75VkC}}</ref>
: 1 libra = 20 soldos = 240 diñeiros (cuxo nome provén de ''denario'').<ref>{{cite web|url=http://www.sizes.com/units/pound_jersey.htm|title=Jersey pound|author=Sizes, Inc.|accessdate=2006-08-12|date=2003-07-28}}</ref>
 
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