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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.
It is achieved by heating the solid. Freezing: The reverse of melting is called freezing. The liquid is converted to solid in this process by lowering the temperature. Boiling: Conversion of liquid into vapour or gas is known as boiling. It is achieved by increasing the temperature of liquid.