What are millimetres?

Some articles on millimetres:

Bombus Pascuorum
... These bees reach a body length of 15–18 millimetres (0.59–0.71 in)(Queen), 9–15 millimetres (0.35–0.59 in)(worker) or 12–14 millimetres (0.47–0.55 in) (drone) ... Their wingspan is 28–32 millimetres (1.1–1.3 in) (Queen), 20–28 millimetres (0.79–1.1 in) (worker) or 24–27 millimetres (0.94–1.1 in) (drone) ... The head is medium long, the snout long, reaching lengths of 13–15 millimetres (0.51–0.59 in) (Queen), 12–13 millimetres (0.47–0.51 in) (worker) and 10 ...
List Of Wettest Tropical Cyclones By Country - France - Réunion Island
1958) World record for 48 hours (2,467 millimetres (97.1 in)) set at Aurere ... Denise (January 7–8, 1966) World record for 12 hours (1,144 millimetres (45.0 in)) and 24 hours (1,825 millimetres (71.9 in)) set at Foc-Foc ... (February 24–28, 2007) World record for 72 hours (3,929 millimetres (154.7 in)) set at Commerson Crater ...
Sisyrinchium Angustifolium
... Stem broadly winged, 2–4 millimetres (0.08–0.16 in) wide, usually branched ... Leaves 2–6 millimetres (0.08–0.24 in) wide ... Tepals 6, blue, 7–10 millimetres (0.3–0.4 in), each tipped with a sharp point, veined, and darkening toward central yellow patch ...
Lechenaultia Macrantha
... The prostrate habit of Lechenaultia macrantha is between fifty and one hundred and fifty millimetres in height and spreading out to one metre ... fleshy, the leaves are narrow, linear, and up to forty millimetres in length ... five petals is between thirty and thirty five millimetres ...
Luria Isabella - Description
... very common cowries reach on average 25–35 millimetres (0.98–1.4 in) of length, with a minimum size of 8 millimetres (0.31 in) and a maximum size of 54 ...