微米（Micrometer、㎛）是长度单位，符号µm。1微米相当于1米个一百万分之一（10-6，此即为“微”个字义）。此外，拉ISO 2955个国际标准中，“u”已经被接纳为一个代替“μ”来代表10-6个国际单位制符号。微米是红外线波长、细胞大小、细菌大小等个数量级。
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