Unitat de superfície

Un metre quadrat fet de tubs de PVC.

Les unitats de superfície són patrons establerts mitjançant acords per facilitar l'intercanvi de dades en els mesuraments quotidians o científics i simplificar radicalment les transaccions comercials.

El mesurament és la tècnica mitjançant la qual assignem un nombre a una propietat física, com a resultat de comparar aquesta propietat amb una altra de semblant presa com a patró, la qual s'adopta com a unitat. La mesura d'una superfície dona lloc a dues quantitats diferents si es fan servir diferents unitats de mesura. Per això, va sorgir la necessitat d'establir una unitat de mesura única per a cada magnitud, de manera que la informació fos fàcilment compresa per tothom.

Sistema Internacional d'Unitats (SI)

Unitat bàsica:

Múltiples:

Submúltiples:

Sistema anglosaxó de mesures

Altres

Pròpies dels Països Catalans:

  • fanecada, usada a gran part del País Valencià, juntament amb els seus múltiples, la jovada
  • hort, usada a Mallorca.
  • jornal, usada a l'occident de Catalunya, Eivissa i nord del País Valencià.
  • quarterada, usada a l'orient de Catalunya, Mallorca i Menorca.
  • tafulla, usada al sud del País Valencià.
  • vessana, usada a Girona.

Altres:

Categoria principal: Unitats de superfície

Aquestes unitats no són oficials al Sistema Internacional d'Unitats.

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