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Evaporation and crystallization of a saturated aqueous solution of Na2SO4 in an acoustically levitated drop in ambient air at T = 20 °C and RH = 42%. The temporal evolution of drop surface area and drop surface temperatures is shown in a while Raman spectra of an evaporating and crystallizing Na2SO4 drop taken at different times (with a sampling time of 30 s) during this process are shown in b
