What is fluid meaning?

Fluid means a substance, such as a gas or a liquid, that can flow and take on the shape of the container around it. Fluid is often used to refer to liquids, which are substances that have a defined volume but can change shape to fit their container. Fluid can also refer to gases, which have no defined shape or volume and can fill any container they are placed in. The properties of fluids, including viscosity, density, and compressibility, are important in various fields, including engineering, physics, and medicine. Understanding the behavior of fluids is essential in designing machines and structures that can work with fluids and in analyzing the flow and circulation of fluids in the human body.