Ain waia, em i wanpela ain samting we planti man i save yusim, planti taim ol i save yusim long indastri, konstraksen, egrikalsa, na laip bilong olgeta de bikos em i gat gutpela wok na em i isi long wokim. Pefomens bilong en i save kamap long ol samting bilong en, diamita, na tritmen bilong en, we i karamapim tripela bikpela samting: ol samting bilong masin, ol kemikel samting, na pasin bilong prosesim.
Long sait bilong masin, ain waia i gat bikpela strong bilong tanim na i gat sampela mak bilong 'ductility'. Ain waia we ol i wokim long 'low-carbon steel (olsem 'galvanized iron wire') em i isi long tanim na tanim, na dispela i mekim em i gutpela long ol wok olsem pasim na samapim. Hai-kabon stiel waia, long narapela sait, i save givim bikpela strong tasol i no strong tumas na planti taim ol i save yusim long ol aplikesen we i nidim bikpela lod-bearing kapasiti, olsem ol spring na ol waia rop. Ol i ken stretim hat bilong ain waia long rot bilong hat tritmen (olsem 'annealing' o 'quenching') long inapim ol narapela narapela aplikesen rikwaemen.
Long sait bilong kemikel, ain waia em i gat ain (Fe), na dispela i mekim na em i save kisim bagarap long 'oxidative corrosion', moa yet long ol ples we i gat planti wara. Long strongim korosen bilong en, ol i save yusim ol samting olsem 'galvanizing', 'copper plating', o 'plastic coating'. Ol ain waia we i gat 'galvanized' (olsem, 'electrogalvanised' o 'hot-dip galvanised') i save rausim win na wara, na i save mekim wok bilong en i stap longpela taim moa. Ol i save yusim planti taim long wokim ol umben bilong lukautim ausait, banis, na ol narapela wok.
Long sait bilong prosesim, ain waia i save givim gutpela wok na ol i ken wokim ol samting i gat kain kain sais na seip long rot bilong droim, tanim, na weldim. Olsem, ol i ken yusim liklik waia long samapim laplap, na ol i ken yusim bikpela waia long strongim haus o wokim ol masin. Na tu, maski pawa na 'thermal conductivity' bilong en i no inap long skelim gut wantaim kopa, ain waia i gat gutpela samting yet long sampela wok we i no gat bikpela pe.
Long pinisim, ol samting bilong ain waia i mekim em i kamap wanpela samting we yu ken yusim long kain kain samting. Strong bilong en long sait bilong masin, wok gut, na strong bilong en long sakim korosen i helpim long planti kain wok bilong en. Ol wok i kamap long bihain taim long saiens bilong ol samting bai skruim wok bilong yusim ain waia long rot bilong gutpela wok na ol nupela teknoloji bilong stretim ol samting antap long graun.