1 millimetre

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To help compare different orders of magnitude this page lists lengths between 10⁻³ m and 10⁻² m (1 mm and 1 cm).

1.0 mm — 1/1000^th of a metre
1.0 mm — 0.039 inches or 5/127 (exactly)
1.0 mm — side of square of area 1 mm²
1.0 mm — edge of cube of volume 1 mm³
1.0 mm — diameter of a pinhead
1.5 mm — length of average flea
2.54 mm — distance between pins on old DIP (dual-inline-package) electronic components
5 mm — length of average red ant
5.56 x 45 mm NATO — standard ammunition size
7.62 x 51 mm NATO — common military ammunition size

See also