µm

IPA/mˌaɪkɹəʊˈɛm/
IPA/mˌaɪkɹoʊˈɛm/

µm — 名詞

1. a written symbol that stands for the unit of length called a micrometre (or micr

1.名詞B2
釋義

微米

百萬分之一公尺的長度單位

a written symbol that stands for the unit of length called a micrometre (or micron); one µm equals one millionth of a metre, and scientists use it to describe objects that are too small to see without a microscope — such as bacteria, cells, and particles of dust or pollution.

例句

The lab report showed the dust particle was about ten µm wide.

實驗室報告顯示，那粒灰塵的寬度大約是十 µm。

µm + adjective of dimension (wide)

Doctors sometimes use µm to describe the size of human cells and tiny blood vessels.

醫生有時會用 µm 來說明人類細胞和微小血管的大小。

use µm to describe [measurement]

同義詞
  • micrometre

    the full name that the symbol µm stands for; used in formal scientific writing

  • micron

    the older, shorter name for the same unit; still common in industry and some technical fields

文法句型

numeral + µm

µm + adjective of dimension

用法筆記

The symbol µ is the Greek letter mu. In science writing, µm always appears with a numeral; do not use it alone (write '50 µm', not 'several µm'). The alternative name 'micron' means the same thing and is sometimes used in informal technical contexts.

常見錯誤

❌The particle measures 5 µm of length.
✅The particle is 5 µm long.
💡In English, units of measurement are placed before the adjective of dimension, not after 'of'.
❌The µm is a tool for measuring cells.
✅The µm is a unit for measuring cells.
💡µm is a unit (a quantity), not a tool or device.