Liquefaction Definition in Science

What Is Liquefaction?

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Liquefaction is the process of converting a substance from its solid or gas phase into its liquid phase. Liquefaction occurs naturally and artificially. Sometimes liquification is considered to be the same as liquefaction. However, some authors consider liquification to be a mis-spelling of liquefaction.


Gases are liquefied by condensation or cooling. Solids are liquefied by heating. Coal liquefaction yields liquid fuels. In the kitchen, a blender may be used to liquefy solids, such as fruits and vegetables.


  • Speight, James G. (2012). The Chemistry and Technology of Coal (3rd ed.).