What is a non example of a displacement fluid?

A non-example of a displacement fluid would be a solid material, such as a block of wood. Unlike displacement fluids, which can flow and fill the shape of their container, solids maintain a fixed shape and volume. Other examples include gases that do not fill a container to create pressure, such as air in a vacuum. Thus, any substance that does not exhibit fluid-like properties when subjected to an external force is considered a non-example of a displacement fluid.