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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Boiling is endothermic (it takes energy to boil water), and so the water cools off as it boils. Eventually, whatâs left will freeze. You can also freeze water by putting dry ice or liquid nitrogen into it. The dry ice will vaporize and the liquid nitrogen will boil, both indicating that they are receiving thermal energy given up by the freezing water.