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Prefixos do Sistema Internacional de Unidades


prefixoSI1795gregohectareares










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Hecto




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Hecto (símbolo h) é um prefixo do SI de unidades que denota um fator de 10², ou 100.


Adotado em 1795, o prefixo vem do grego ἑκατόν, significando centena.


Por exemplo:
1 hectare = 100 ares = 1 hm² = 10 000 m²




















































































































































































Prefixos do SI
  • v

  • d

  • e



Prefixo
1000m10n
Escala curta

Escala longa
Equivalente numérico
Desde[nota 1]
Nome
Símbolo

iota
Y
100081024
Septilhão

Quadrilião
1 000 000 000 000 000 000 000 000
1991

zeta
Z
100071021
Sextilhão
Milhar de trilião
1 000 000 000 000 000 000 000
1991

exa
E
100061018
Quintilhão

Trilião
1 000 000 000 000 000 000
1975

peta
P
100051015
Quadrilhão
Milhar de bilião
1 000 000 000 000 000
1975

tera
T
100041012
Trilhão

Bilião
1 000 000 000 000
1960

giga
G
10003109
Bilhão
Milhar de milhão
1 000 000 000
1960

mega
M
10002106
Milhão

Milhão
1 000 000
1960

quilo
k
10001103
Mil

Milhar
1 000
1795

hecto
h
10002/3102
Cem

Centena
100
1795

deca
da
10001/3101
Dez

Dezena
10
1795

nenhum
10000100
Unidade

Unidade
1


deci
d
1000-1/310−1
Décimo

Décimo
0,1
1795

centi
c
1000-2/310−2
Centésimo

Centésimo
0,01
1795

mili
m
1000-110−3
Milésimo

Milésimo
0,001
1795

micro
µ
1000-210−6
Milionésimo

Milionésimo
0,000 001
1960

nano
n
1000-310−9
Bilionésimo
Milésimo de milionésimo
0,000 000 001
1960

pico
p
1000-410−12
Trilionésimo

Bilionésimo
0,000 000 000 001
1960

femto
f
1000-510−15
Quadrilionésimo
Milésimo de bilionésimo
0,000 000 000 000 001
1964

atto
a
1000-610−18
Quintilionésimo

Trilionésimo
0,000 000 000 000 000 001
1964

zepto
z
1000-710−21
Sextilionésimo
Milésimo de trilionésimo
0,000 000 000 000 000 000 001
1991

iocto
y
1000-810−24
Septilionésimo

Quadrilionésimo
0,000 000 000 000 000 000 000 001
1991


  1. ↑ O sistema métrico foi introduzido em 1795 com seis prefixos. As outras datas estão relacionadas ao reconhecimento pela resolução da Conferência Geral de Pesos e Medidas (CGPM).







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