What kind of compounds liquefy when they are brought together?

Eutectic compounds are a specific type of mixture that, when combined, have a lower melting point than any of the individual components. This property allows eutectic mixtures to liquefy at a specific temperature, which is often lower than the melting points of the single substances that make them up. The significance of eutectic compounds lies in their application in various pharmaceutical formulations, particularly in improving drug solubility and stability.

In contrast, hydrophilic refers to substances that have a strong affinity for water, while lipophilic describes substances that are attracted to fats and oils. These terms relate to solubility but do not inherently describe the specific behavior of compounds when mixed. Volumetric is a term that pertains to measurements of volume and does not describe a chemical property related to melting or liquefaction. Thus, eutectic is the most accurate term that describes the behavior of compounds that liquefy upon combination.