微米(英式英语:Micrometre,美式英语:Micrometer)是长度单位,符号µm。1微米相当于1米的一百万分之一(10-6,此即为“微”的字义)。此外,在ISO 2955的国际标准中,“u”已经被接纳为一个代替“μ”来代表10-6的国际单位制符号[来源请求]。微米是红外线波长、细胞大小、细菌大小等的数量级。
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