In classical fluid mechanics, a fluid is said to behave as a continuum. In this context, continuum means: a) that the fluid itself is made up of a continuous mass

that has readily identifiable properties at any and every point in the mass. b) that the fluid is continuous and continues to the boundaries of the container or atmosphere. c) that the fluid cannot exhibit discontinuities in pressure, temperature, or density, even under supersonic conditions. d) that the fluid will fill completely the container that it is put into.