A unit of length equal to one thousandth(10-3) of an inch(0.0254 millimeter), used, for example, to specify the diameter of wire or the thickness of materials sold in sheets.

• 密耳长度单位，等于一英寸的千分之一(10－3)(0.；0254毫米)；如用来标明电线的直径或按页出售的材料的厚度。