Niki santimetero, DN ni iki, kandi what ni iki?

Intambwe ni iki:

Intambwe (“) nigice gikunze gukoreshwa muri sisitemu yo muri Amerika, nko kumiyoboro, indangagaciro, flanges, inkokora, pompe, tees, nibindi. Urugero, ubunini bwa 10 ″.

Ijambo intambwe (mu magambo ahinnye yiswe “in.”) Mu Giholande ryasobanuraga igikumwe, naho santimetero ni uburebure bw'igice kimwe cy'intoki. Birumvikana ko uburebure bwintoki yumuntu burashobora gutandukana. Mu kinyejana cya 14, Umwami Edward II w'Ubwongereza yatanze “intambwe isanzwe yemewe.” Igisobanuro cyacyo cyari: uburebure bwa bitatu mu binini binini bya sayiri, byashyizwe ku musozo.

Mubisanzwe, 1 ″ = 2.54cm = 25.4mm.

DN ni iki:

DN nigice gikunze gupimwa mubushinwa nu Burayi, kandi gikoreshwa mukugaragaza ibisobanuro byimiyoboro, indangagaciro, flanges, fitingi, pompe, nibindi, nka DN250.

DN bivuga diameter nominal yumuyoboro (bizwi kandi nka bore nominal). Nyamuneka menya ko iyi atari diameter yo hanze cyangwa imbere imbere, ahubwo ni impuzandengo ya diametre zombi, zizwi nkikigereranyo imbere.

Niki Φ:

Φ nigice gisanzwe cyo gupima gikoreshwa kugirango yerekane diameter yinyuma yimiyoboro, yunamye, utubari tuzengurutse, nibindi bikoresho, kandi irashobora no gukoreshwa yerekeza kuri diameter ubwayo, nka Φ609.6mm bivuga diameter yo hanze ya 609.6 mm.