Bî-bí sī niû tn̂g-té iōng--ê SI tan-ūi, hû-hō siá chò µm (µ sī hui-chèng-sek ê siá-hoat). I ê tēng-gī sī 1 bí (kong-chhioh) ê 1-pah-bān-hun chi it (1×10−6 m).
Chit phiⁿ bûn-chiuⁿ sī chi̍t ê phí-á-kiáⁿ. Chhiáⁿ tàu siu-kái hō͘ i ū phong-phài ê lōe-iông.
