Fluidi

Fluidi is the Italian plural noun meaning liquids or fluids. The singular form is fluido. In everyday language, fluidi refers to substances that can flow, such as acqua, latte, olio, and other substances. In broader scientific contexts, fluids include both liquids and gases, so the term is used to describe substances that deform and flow under applied stress. The term liquidi is typically used for liquids when the emphasis is on volume and contained form.

Etymology and usage notes: fluidi derives from the Latin fluidus, from fluere “to flow.” Italian inherited fluido from this lineage, with fluidi serving as the standard plural. In scientific writing, fluido is used in phrases like dinamica dei fluidi, idrodinamica and meccanica dei fluidi to discuss properties such as density, viscosity and compressibility, as well as flow behavior. The related noun fluidità describes fluidity or fluency.

See also: liquido, idrodinamica, dinamica dei fluidi.