V2EX atto

Atto

定义 Definition

atto- 是国际单位制(SI)中的十进制词头,表示 10(十的负十八次方),即“百亿亿分之一”。常用于计量极其微小的量,如 attosecond(阿秒)attometer(阿米)等。(也可作名词指“atto- 这个词头”。)

发音 Pronunciation (IPA)

/to/

例句 Examples

An attosecond is an extremely short time.
阿秒是一种极其短暂的时间单位。

Advances in ultrafast lasers allow scientists to observe electron motion on the atto- timescale, revealing details that were previously invisible.
超快激光的发展使科学家能够在“atto-”级别的时间尺度上观察电子运动,从而揭示过去无法看见的细节。

词源 Etymology

atto- 来自丹麦语 atten(“十八”),在国际单位制词头命名中被选用来表示 10(与“十八”对应的指数 18 相关)。该词头常见于科学与工程语境,用于描述极微小的数量级。

相关词 Related Words

文学与著作 Literary Works

  • The Feynman Lectures on Physics(《费曼物理学讲义》)在单位与数量级讨论中常涉及 SI 词头体系(包括 atto- 等)。
  • The Road to Reality by Roger Penrose(《通向实在之路》)涉及物理量尺度与科学计量时可能使用到 SI 词头(如 atto-)。
  • CODATA Recommended Values of the Fundamental Physical Constants(CODATA 基本物理常数推荐值文献)在高精度计量与单位表达中常见 atto- 级别前缀。
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