Liquifying is the process of turning a solid or highly viscous substance into a liquid state. There are various synonyms that can be used to describe this action. These include melting, dissolving, liquefying, thawing, and melting down. Melting refers to the process in which a solid substance is transformed into a liquid state through the application of heat. Dissolving signifies the process of a solid substance being broken down into smaller particles and mixed with a liquid solvent. Liquefying is the general term that encompasses both melting and dissolving. Thawing refers to the process by which something frozen is heated until it becomes liquid. Finally, melting down is the process of changing an object or a substance into liquid through a chemical reaction or intense heat.