51. Qhov ntsuas kub kom qhuav yog dab tsi?

Qhov kub kom qhuav yog txiav txim siab los ntawm hom hnyav, vim cov kuab tshuaj sib txawv muaj cov ntsiab lus melting sib txawv. Piv txwv li, zinc chloride muaj qhov melting point ntawm 283℃thiab qhov kub ntawm 732 degree, thaum ammonium chloride pib sublimation ntawm 350 degree. Qhov no txhais tau tias zinc chloride yuav tsum tau ziab kom qhuav ntau dua li ammonium chloride. Yog li ntawd, zinc chloride feem ntau qhuav ntawm 200-250 degree, hos ammonium chloride tsuas yog qhuav ntawm ib ncig ntawm 120 degree. Kev hais lus nruj me ntsis, qhov txwv siab ntawm qhov ziab kom qhuav yog txiav txim siab los ntawm cov kuab tshuaj melting point, thaum qhov qis qis yog txiav txim siab los ntawm qhov kub ntawm qhov hnyav ntawm cov dej crystallization tuaj yeem tshem tawm tag nrho.