Liquefaction, sometimes liquification, refers to any process which either generates a liquid from a solid or a gas, or generates a non-liquid phase which behaves in accordance with fluid-dynamics. 
In geology, soil liquefaction refers to the process by which water-saturated, unconsolidated sediments are transformed into a substance that acts like a liquid, often in an earthquake. By undermining the foundations and base courses of infrastructure, liquefaction can cause serious damage.
Physics and chemistry
In physics and chemistry, the phase transitions from solid and gas to liquid (melting and condensation, respectively) may be referred to as liquefaction. The melting point (sometimes called liquefaction point) is the temperature and pressure at which a solid becomes a liquid.
In commercial and industrial situations, the process of condensing a gas to liquid is sometimes referred to as liquefaction of gases.
In kitchen or laboratory settings, solids may be chopped into smaller parts sometimes in combination with a liquid, for example in food preparation or laboratory use. This may be done with a blender, or liquidiser in British English.
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- Cryogenic energy storage
- Liquid air
- Liquid helium
- Liquid hydrogen
- Liquid nitrogen
- Liquid oxygen
- Liquefied natural gas
- Liquefied petroleum gas
- USGS. "About Liquefaction".
- Robbins and Cotran: Pathologic Basis of Disease, 8th Ed. 2010. Pg. 15
- Gardner, Kavid (2001). Textbook of Assisted Reproductive Technology Laboratory and Clinical Perspectives. Taylor and Francis. p. 63. Retrieved 2013-11-03.