fluid

a substance that is fluid at room temperature and pressure

continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas

subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"

characteristic of a fluid; capable of flowing and easily changing shape

smooth and unconstrained in movement; "a long, smooth stride"; "the fluid motion of a cat"; "the liquid grace of a ballerina"

in cash or easily convertible to cash; "liquid (or fluid) assets"

affording change (especially in social status); "Britain is not a truly fluid society"; "upwardly mobile"