Inchi ndi chiyani, DN ndi chiyani, ndipo Φ ndi chiyani?

Inchi ndi chiyani:

Inchi (“) ndi njira yoyezera yomwe imagwiritsidwa ntchito kwambiri ku America, monga mapaipi, mavavu, ma flanges, zigongono, mapampu, mateti, ndi zina zotero. Mwachitsanzo, kukula kwa 10″.

Mawu akuti inchi (ofupikitsidwa monga “mu.”) m’Chidatchi poyambirira amatanthauza chala chachikulu, ndipo inchi ndi utali wa gawo limodzi la chala chachikulu. N’zoona kuti kutalika kwa chala chachikulu cha munthu kumasiyana. M’zaka za zana la 14, Mfumu Edward II ya ku England inapereka “chiŵerengero chokhazikika chalamulo.” Tanthauzo lake linali: kutalika kwa mbewu zitatu zazikulu kwambiri za barele, zomwe zatsala pang'ono kutha.

Nthawi zambiri, 1″=2.54cm=25.4mm.

DN ndi chiyani:

DN ndi gawo loyezera lomwe limagwiritsidwa ntchito kwambiri ku China ndi ku Europe, ndipo limagwiritsidwa ntchito posonyeza momwe mapaipi, ma valve, ma flanges, zolumikizira, mapampu, ndi zina zambiri, monga DN250.

DN imatanthawuza kukula kwake kwa chitoliro (chomwe chimadziwikanso kuti bore mwadzina). Chonde dziwani kuti uku si mainchesi akunja kapena m'mimba mwake, koma pafupifupi ma diameter onse awiri, omwe amadziwika kuti m'mimba mwake.

Kodi Φ ndi chiyani:

Φ ndi muyeso wamba womwe umagwiritsidwa ntchito kuwonetsa kukula kwa mapaipi, mapindikidwe, mipiringidzo yozungulira, ndi zida zina, ndipo atha kugwiritsidwanso ntchito kutanthauza m'mimba mwake, monga Φ609.6mm yomwe imatanthawuza kukula kwakunja kwa 609.6. mm.