Ka wehewehe ʻana o nā ʻāpana honua
ʻŌnaehana o nā ʻĀpana
Eia kekahi laʻana, inā ʻoe e ana i kou kiʻekiʻe a hōʻike iā ia ma ke ʻano he 100, ʻaʻohe manaʻo o ka hopena. Pēlā nō, inā ʻoe e ana i kou kaumaha kino a hōʻike iā ia ma ke ʻano he 20, ʻaʻohe manaʻo o ka hopena a hiki ʻole ke hoʻomaopopo ʻia e nā poʻe ʻē aʻe. Ma waho aʻe o ka hōʻike ʻana i kahi helu a i ʻole kiʻi kikoʻī, pono e hele pū ʻia ke ana me kahi anakahi. Inā ʻōlelo ʻoe he 2 fathoms kou kiʻekiʻe, a laila ʻo 2 ka helu o ke ana a ʻo fathoms nā anakahi āu e hoʻohana ai. Hoʻomaopopo ka poʻe i maʻa i ka hoʻohana ʻana i nā fathoms i kēia ana. A i ʻole, inā ʻoe e ana i ka lōʻihi o kahi papa āu e hoʻohana ai ma ka papa a hōʻike iā ia ma ke ʻano he 5 span, hiki ke hoʻomaopopo ʻia ka hopena e nā poʻe ʻē aʻe i hoʻohana i nā spans ma ke ʻano he anakahi.
Nui nā ʻano anakahi i hoʻohana ʻia ma ka honua, ma muli o nā loina kūloko. No ka laʻana, ʻo ke anakahi o ka lōʻihi i hoʻohana ʻia ma ʻEnelani ʻo ia ka iwilei, a i ʻole ke anakahi o ka lōʻihi i hoʻohana ʻia ma Palani ʻo ia ka wāwae, a i ʻole ke anakahi o ka lōʻihi i hoʻohana ʻia ma ʻAigupita kahiko ʻo ia ke kūbita. Inā ua maʻa ʻoe i ka hoʻohana ʻana i ke anakahi span a i ʻole fathom a laila heluhelu ʻoe i kahi ʻatikala e ʻōlelo ana ʻo ke kuahiwi kiʻekiʻe loa ma ka honua he 10.000 iwilei, no ka laʻana, e huikau maoli nō ʻoe a ʻaʻohe kiʻi maopopo o ke kiʻekiʻe o ka mauna.
ʻO ka wehewehe ʻana o 1 ʻāpana ka mamao ma waena o ka piko o ka manamana nui a me ka piko o ka manamana lima kuhikuhi i ka wā e kīkoʻo ʻia ai. ʻO 1 fathom ka mamao ma waena o ka piko o ka manamana lima waena a me ka piko o ka lima i ka wā e kīkoʻo ʻia ai ka lima. ʻO 1 iwilei ka mamao ma waena o ka piko o ka ihu o ke aliʻi o ʻEnelani (1120 AD) a me ka piko o kona lima i kīkoʻo ʻia. ʻO 1 kapuaʻi ka lōʻihi o ka wāwae o ke Aliʻi Louis XIV, ke Aliʻi o Palani. ʻO 1 kūbita ka mamao ma waena o ke kuʻekuʻe lima o ka lima a me ka piko o ka manamana lima waena i ka wā e kīkoʻo ʻia ai. ʻO 1 ʻāpana a i ʻole 1 fathom a i ʻole 1 iwilei a i ʻole 1 kapuaʻi, he laʻana ia o kahi anakahi kumu o ka lōʻihi. Inā ʻo ka lōʻihi o kahi papa ʻaina = 5 ʻāpana a laila ʻo ka lōʻihi o ka papa ʻaina he 5 manawa o ka ʻāpana o ke kanaka e ana ana. I kēia hihia, hoʻohana ʻia ka ʻāpana kanaka ma ke ʻano he anakahi maʻamau no ke ana ʻana i ka lōʻihi.
He mea nui e hoʻomaopopo he ulu ke kino o ke kanaka, no laila hiki ke loli ke kīkoʻo, ka fathom, ke kūbita, ka wāwae, a i ʻole ka iwilei. Pēlā nō, ʻo ka hoʻohana ʻana i nā anakahi like ʻole e hiki ke hoʻopilikia i ka poʻe i kamaʻāina ʻole iā lākou. No ka loaʻa ʻana o nā ana pololei a hilinaʻi hoʻi, pono kahi nui kumu maʻamau i loli ʻole a hiki ke hana hou ʻia i hiki ke hoʻohana ʻia ma ka honua holoʻokoʻa.
ʻO ka ʻōnaehana o nā anakahi i hoʻohana ʻia e nā kānaka ʻepekema a me nā ʻenekinia a puni ka honua i kapa mua ʻia ʻo ka ʻōnaehana metric. Mai ka makahiki 1960, ua kapa ʻia ʻo ia ʻo ka International System, a i ʻole SI no ka pōkole. ʻO nā anakahi SI no ka nui o ke kālā hiki ke ʻike ʻia ma ka papa o nā nui kumu.
ʻĀpana nā nui i loaʻa hiki ke hōʻike ʻia ma nā anakahi ana kumu ʻelua a ʻoi aku paha; no ka laʻana, ʻo ke anakahi o ka ʻāpana he m2, ʻo ke anakahi o ka wikiwiki he m/s, ʻo ke anakahi o ka nui o ka paʻapū he kg/m3, ʻo ke anakahi o ka wikiwiki he m/s2, ʻo ke anakahi o ka ikaika he kg m/s2, ʻo nā anakahi o ka hana a me ka ikehu he kg m2/s2, ʻo ke anakahi o ka mana he kg m2/s3.
Ua hāʻawi ʻia kekahi mau nui i loaʻa nona nā anakahi i loaʻa i kekahi mau anakahi kumu i nā inoa kūikawā; no ka laʻana, ke anakahi o ka ikaika kg m/s2 i kapa ʻia ʻo Newton (N), ke anakahi o ka hana a me ka ikehu kg m2/s2 i kapa ʻia ʻo Joule (J), ke anakahi o ka mana kg m2/s3 i kapa ʻia ʻo Watt (W).
Prefix Unit
Hiki iā mākou ke hōʻike i nā anakahi SI ma ke ʻano he nui a liʻiliʻi paha me ka hoʻohana ʻana i nā prefix anakahi. ʻO nā prefix anakahi he mau hoʻonui o 10 o ke anakahi kumu. Hoʻohui pinepine ʻia nā prefix anakahi i nā anakahi SI e hana i nā anakahi hou.
Nā laʻana o nā prefix unit i hoʻohui ʻia i nā unit kumu
Nā hiʻohiʻona o nā prefix unit i hoʻohui ʻia i nā unit i loaʻa:
1 kW (kilowatt) = 103 W = 1000 W —> W = Watt (Ke anakahi o ka mana)
1 MW (megawatt) = 106 W = 1000.000 W —> W = Watt (Ke anakahi o ka mana)
1 MV (megavolt) = 106 V = 1000.000 V —> V = Volt (ʻĀpana o ka uila uila)
1 nC (nanocoulomb) = 1 nC = 10-9 C —> C = Coulomb (Ke anakahi o ka ikaika uila)
1 kPa (kilopascal) = 103 Pa —> Pa = Pascal (Ke anakahi o ke kaomi)
1 GHz (gigahertz) = 109 Hz —> Hz = Hertz (ʻĀpana alapine)
