Homonym: fluid (Smooth)
A fluid is a substance that can flow and take the shape of its container. This includes liquids, like water and oil, as well as gases, such as air. Fluids have no fixed shape and can change their form easily, which allows them to fill spaces and move around.
Fluids are characterized by their ability to exert pressure and can be affected by temperature and viscosity. Viscosity refers to how thick or thin a fluid is, influencing how easily it flows. Understanding fluids is essential in various fields, including engineering, meteorology, and medicine.