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幺[科托]
yocto- (symbol y) is an SI prefix in the SI system of units denoting a factor of 10−24 or 0.000000000000000000000001.
Adopted in 1991,it comes from the Greek οκτώ,meaning eight,because it is equal to 1/10008.As of 2007,yocto- is the smallest SI prefix to be confirmed.
参考:http://col.njtu.edu.cn/zskj/2014/%CE%EF%C0%ED%BB%AF%D1%A7%CD%F8%C2%E7%BF%CE%B3%CC/appendix/appendix4/appendix4.htm
1年前
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