Vim tias iav yog qhov sib xyaw thiab tsis-ci, nws tsis muaj qhov chaw kub tsis pauv. Kev hloov pauv ntawm cov iav los ntawm cov khoom ua kua yog nqa tawm nyob rau hauv qee qhov ntsuas kub (qhov ntawd yog, qhov ua kom kub muag ntau). Tsis zoo li cov tshuaj crystalline, nws tsis muaj qhov chaw tas melting. Qhov muag kub ua kom sov yog Tg ~ T1, Tg yog qhov hloov pauv, T1 yog qhov nruab nrab kub, thiab qhov sib txuam yog 1013.4dPa, s,
