mmm

mmm — abbreviation

1. a written short form of 'micromillimeter' — a unit of length equal to one millio

1.縮寫C1
釋義

a written short form of 'micromillimeter' — a unit of length equal to one millionth (1/1,000,000) of a meter, used in science and engineering to describe very small distances, sizes, or gaps.

例句

The coating on the lens was only 200 mmm thick, invisible to the naked eye.

number + mmm + adjective complement

Niran measured the diameter of the fiber at 35 mmm using an electron microscope.

scientific measurement context

同義詞
  • µm

    the more common international symbol for micrometer/micron, equivalent to 1 mmm

  • micron

    an older term for the same unit; still used in some scientific fields

文法句型

number + mmm + (optional noun)

用法筆記

Always written in lowercase. Used almost exclusively in technical or scientific writing — you will rarely encounter 'mmm' in everyday speech or general media. Do not confuse with 'mm' (millimeter), which is 1,000 times larger.

常見錯誤

❌The screw was 5 mmm long.
✅The screw was 5 mm long.
💡a 5-micromillimeter screw would be far too small for everyday use; 'mm' (millimeter) is the correct unit for visible objects.