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阿托

,又译为阿托(英語:atto-),是一个国际单位制词头,符号a,代表10-18倍,或0.000 000 000 000 000 001。

它源自於丹麦语atten,意思是“十八”。

使用举例:

HIV-1病毒质量约为10-18 kg,即10-15 g,可表示为1 fg或1000 ag。

国际单位制词头
中國大陸名称 臺灣名称 英语名称 符号 1000m 10n 十进制 启用时间[n 1]
昆(昆它) quetta Q 100010 1030 1000000000000000000000000000000 2022
容(容那) ronna R 10009 1027 1000000000000000000000000000 2022
尧(尧它) yotta Y 10008 1024 1000000000000000000000000 1991
泽(泽它) zetta Z 10007 1021 1000000000000000000000 1991
艾(艾可萨) exa E 10006 1018 1000000000000000000 1975
拍(拍它) peta P 10005 1015 1000000000000000 1975
太(太拉) tera T 10004 1012 1000000000000 1960
吉(吉咖) giga G 10003 109 1000000000 1960
百萬 mega M 10002 106 1000000 1873
kilo k 10001 103 1000 1795
hecto h 10002/3 102 100 1795
deca da 10001/3 101 10 1795
10000 100 1
deci d 1000−1/3 10-1 0.1 1795
centi c 1000−2/3 10-2 0.01 1795
milli m 1000-1 10-3 0.001 1795
micro µ 1000-2 10-6 0.000001 1873
纳(纳诺) nano n 1000-3 10-9 0.000000001 1960
皮(皮可) pico p 1000-4 10-12 0.000000000001 1960
飞(飞母托) femto f 1000-5 10-15 0.000000000000001 1964
阿(阿托) atto a 1000-6 10-18 0.000000000000000001 1964
仄(仄普托) zepto z 1000-7 10-21 0.000000000000000000001 1991
幺(幺科托) yocto y 1000-8 10-24 0.000000000000000000000001 1991
柔(柔托) ronto r 1000-9 10-27 0.000000000000000000000000001 2022
亏(亏科托) quecto q 1000-10 10-30 0.000000000000000000000000000001 2022
  1. ^ 1795年引进的国际单位制包含6个词头。1873年随厘米-克-秒制引进mega和micro。其余的时间以國際度量衡大會的决议为准。

参见

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