E like me kā mākou e ʻike ai, koho pinepine ʻia nā mea e like me ka sponge, foamed plastic, rubber a me ka lāʻau i mea cushioning a me nā mea anti-collision i ke ola maoli. E like me kekahi o nā mea metala porous, he aha nā mea maikaʻi o kona hoʻopaʻa ʻana i ka ikehu a me ka pale?

Ma ka ʻōlelo a ka poʻe kamaʻāina, loaʻa i kēlā me kēia mea e hoʻemi ana i ka ikehu a hoʻopaʻa i kona waiwai kiʻekiʻe loa. Ma hope o ka ʻoi aku o ka ʻāpana o ka ʻāpana i kekahi kaomi, e nalowale ka hopena hoʻopaʻa i ka ikehu a hoʻopaʻa. No laila, ʻo nā sponges, nā mea i hoʻopaʻa ʻia, nā ʻōpala, nā alumini foamed, a me nā mea ʻē aʻe.

Ma ke ʻano he mea metala māmā loa e hiki ke lana ma luna o ka wai, ʻo ka pahu alumini he 0.2-0.4g/cm³, ʻo ia ka 1/30 o ka nui o ke kila; eia nae, he 1.5 ka nui o kona oolea piko o ke kila; ma lalo o ke kaumaha hoʻokahi, ʻO ka ikaika compressive he 5 mau manawa o ke kila; i ka manawa like, ʻo ka hana hoʻoheheʻe ʻana o ka alumini foamed he 5-10 mau manawa o ka metala, a ʻo ka alumini foamed me ka porosity ʻoi aku ma mua o 80% hiki ke komo i ka 20J / cm³ o ka ikehu ke hoʻololi ʻia e 50%, ʻo ia ka mea kūpono loa. . Mea hoʻohāhā.