👉 The term "not fluid" refers to a substance that does not exhibit the characteristic properties of liquids, such as having a definite shape but taking the shape of its container. Unlike liquids, which flow and can fill any space, non-fluids (or solids) maintain a fixed volume and shape. They do not flow or change their form in response to external forces, making them rigid and resistant to deformation. Examples include metals, rocks, and ice, which are solid but can still have some structural integrity and resistance to compression.
