He aha ka ʻīniha:
ʻO ka ʻīniha (“) he ʻāpana ana maʻamau i hoʻohana ʻia ma ka ʻōnaehana ʻAmelika, e like me nā paipu, nā pahu, nā ʻili, nā kuʻekuʻe, nā pamu, nā kī, a pēlā aku.
ʻO ka huaʻōlelo ʻīniha (i hoʻopau ʻia ʻo “in.”) ma ka ʻōlelo Dutch ʻo ia ka manamana lima, a ʻo ka ʻīniha ka lōʻihi o kahi ʻāpana o ka manamana lima.ʻOiaʻiʻo, hiki ke ʻokoʻa ka lōʻihi o ka manamana lima o ke kanaka.I ke kenekulia 14, ua hoʻopuka ʻo King Edward II o ʻEnelani i kahi "iniha kānāwai maʻamau."ʻO kāna wehewehe ʻana: ʻo ka lōʻihi o ʻekolu o nā hua bale nui loa, waiho ʻia i hope a i hope.
ʻO ka maʻamau, 1″=2.54cm=25.4mm.
He aha ka DN:
ʻO DN kahi ʻāpana ana maʻamau i Kina a me ʻEulopa, a hoʻohana ʻia e hōʻike i nā kikoʻī o nā paipu, valves, flanges, fittings, pumps, etc., e like me DN250.
ʻO ka DN e pili ana i ke anawaena inoa o ka paipu (ʻike pū ʻia ʻo ka nominal bore).E ʻoluʻolu, ʻaʻole kēia ke anawaena o waho a ʻaʻole hoʻi ke anawaena o loko, akā ʻo ka awelika o nā anawaena ʻelua, ʻike ʻia ʻo ke anawaena waena.
He aha ka Φ:
ʻO Φ kahi anana maʻamau i hoʻohana ʻia e hōʻike i ke anawaena o waho o nā paipu, nā piko, nā kaola pōʻai, a me nā mea ʻē aʻe, a hiki ke hoʻohana ʻia e kuhikuhi i ke anawaena ponoʻī, e like me Φ609.6mm e pili ana i kahi anawaena waho o 609.6 mm.
Ka manawa hoʻouna: Mar-24-2023
