ʻO kekahi o nā waiwai koʻikoʻi o kahi mea, ʻo ia ka density, ʻo ia hoʻi ka nui o ka paʻanya. ʻO ka huaʻōlelo anuanu ʻo ia ka density. ʻO ka density ka lakio o ka nuipa i ka nui o kahi mea. Ma ke ʻano makemakika, ua kākau ʻia:
ρ = m/V
ʻO (ρ heluhelu ʻia ʻo "rho") kahi leka Helene i hoʻohana pinepine ʻia no ka hōʻike ʻana i ka nuipaʻa, ʻo m ka nuipaʻa a ʻo V ka nui.
ʻŌnaehana honua o nā ʻāpana ka nui o ka paʻa he kilokani no ka mika cubic (kg/m3No nā anakahi CGS, ʻo ia hoʻi nā kenimika, nā grama, a me nā kekona, ua hōʻike ʻia ke anakahi density ma nā grama no ke kenimika cubic (gr/cm3).
Eia ka ʻikepili mānoanoa no kekahi mau mea.
ʻO ka nui o ka mea i ʻōlelo ʻia ma ka papa ma luna, ʻo ia ka nui o ka mea ma ka mahana o 0o C a me ke kaomi o 1 atm (atm = anakahi o ke kaomi)
Ka nui o ka ea a me ka wai
ʻOkoʻa ka nui o ka wai mai ka nui o ka mea paʻa. Loaʻa i ka hao a i ʻole ka lāʻau ka nui like ma nā ʻāpana āpau. He ʻokoʻa kēia mai nā wai, e like me ka ea a i ʻole ka wai. ʻO ke kiʻekiʻe o ka ea ma luna o ka ʻilikai, ʻo ka haʻahaʻa o kona nui. ʻO kēia no ka mea e emi ana ka ikaika o ke koʻikoʻi me ke kiʻekiʻe. ʻO ke kiʻekiʻe o kou hele ʻana, ʻo ka emi ʻana o ka ikaika koʻikoʻi, no laila e emi pū ana ka nui o ka ea i huki ʻia. ʻOi aku ka nui o ka ea kokoke i ka ʻilikai ma mua o ka nui o ka ea ma ka piko o ka mauna. Ma kahi like a i ʻole ka nui, ʻoi aku ka nui o ka ea kokoke i ke kai a no laila ʻoi aku ka nui o ka nui. I ka ʻaoʻao ʻē aʻe, ʻoi aku ka liʻiliʻi o ka nui o ka ea ma ka piko o ka mauna a no laila ʻoi aku ka haʻahaʻa o ka nui. ʻO ka mamao aku mai ka ʻilikai, ʻoi aku ka haʻahaʻa o ka nui o ka ea.
Pehea e pili ana i ka nui o ka wai, no ka laʻana ka wai kai? Ua haku ʻia ka ea me nā ʻātoma a i ʻole nā molekala kaʻawale, no laila ua hoʻopilikia nui ʻia ka nui o ka ea e ka ikaika o ka ikaika umekaumaha e huki ana iā ia. I ka ʻaoʻao ʻē aʻe, ʻaʻole kū hoʻokahi nā molekala wai a ʻaʻole hoʻokaʻawale ʻia kekahi mai kekahi; ua nakinaki ʻia lākou a ʻaʻole neʻe maʻalahi. No laila, ʻaʻole ʻokoʻa loa ka nui o nā molekala wai ma ka ʻilikai mai ka nui o nā molekala wai ma ka papa kai. No laila, ua aneane like ka nui o ka wai kai ma ka ʻilikai me ka nui o ka wai kai ma ka papa kai, ʻoiai ua ʻokoʻa ke kiʻekiʻe.
Ka hopena o nā loli o ka mahana a me ka nui ma ka nui o nā wai
Hoʻonui ʻia kēlā me kēia mea (piʻi ka nui) inā piʻi kona mahana a ʻuʻuku (emi ka nui) inā emi kona mahana. Koe wale nō ka wai ma ka mahana o 0 o C–4 o C. Hōʻike kēia mau laʻana i kēia. Ua ʻike anei ʻoe i kahi hanana kahi i pālahalaha ai ka huila mokokaikala i kū ʻia ʻoiai ʻaʻohe leaka? Ua pālahalaha ka huila mokokaikala no ka mea ua emi ka nui o ka ea i loko o ka huila. Ua emi ka nui o ka ea no ka mea ua emi ka mahana o ka ea. Hana ʻia kēia ke anuanu loa ka mahana o ka ea. ʻO kekahi laʻana. E ʻoluʻolu e puhi i kahi baluna laholio a hiki i ka wā e pālahalaha ai a laila e nakinaki i ka waha o ka baluna i ʻole e puka ka ea. E hoʻomaloʻo i ka baluna ma kahi wela. E nānā i ka mea e hana ʻia ana i ka baluna! E pahū ka baluna no ka mea e piʻi ana ka nui o ka ea i loko o ka baluna ma muli o ka piʻi ʻana o ka mahana o ka ea. ʻAʻole hiki i ka elasticity o ka rubber ke kū i ka hoʻonui ʻana o ka ea no laila ua pahū ka baluna.
Hōʻike nā hiʻohiʻona ʻelua ma luna nei e hiki ke loli ka nui o kahi wai, inā he wai a he kinoea paha, inā loli kona mahana. ʻO ke kaumaha o ka ea i loko o kahi huila pani a i ʻole ka baluna e mau ana; ʻo ka nui wale nō e loli. ʻO nā loli i ka nui ke kumu e loli ai ka nui o ka ea.
