Hecto

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
Prefixo Base 10 Decimal Adoção
[nb 1]
Nome Símbolo
quetta Q 1030 1000000000000000000000000000000 2022[1]
ronna R 1027 1000000000000000000000000000
yotta Y 1024 1000000000000000000000000 1991
zetta Z 1021 1000000000000000000000
exa E 1018 1000000000000000000 1975[2]
peta P 1015 1000000000000000
tera T 1012 1000000000000 1960
giga G 109 1000000000
mega M 106 1000000 1873
quilo k 103 1000 1795
hecto h 102 100
deca da 101 10
— — 100 1 —
deci d 10−1 0,1 1795
centi c 10−2 0,01
mili m 10−3 0,001
micro μ 10−6 0,000001 1873
nano n 10−9 0,000000001 1960
pico p 10−12 0,000000000001
femto f 10−15 0,000000000000001 1964
atto a 10−18 0,000000000000000001
zepto z 10−21 0,000000000000000000001 1991
yocto y 10−24 0,000000000000000000000001
ronto r 10−27 0,000000000000000000000000001 2022[1]
quecto q 10−30 0,000000000000000000000000000001
Notas
  1. ↑ Prefixos adotados antes de 1960 já existiam antes do SI. A introdução do sistema CGS foi em 1873.
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  1. ↑ a b «On the extension of the range of SI prefixes». 18 de novembro de 2022. Consultado em 5 de fevereiro de 2023 
  2. ↑ «Metric (SI) Prefixes». NIST 

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