| surface of discontinuity [¦sǝr·fǝs ǝv ´dis´känt·ǝn`ü·ǝd·ē] FLUID MECHANICS A surface within a fluid across which there is a discontinuity in fluid velocity; often generated in the wake of a body moving relative to the fluid. METEOROLOGY An interface, applied to the atmosphere; for example, an atmospheric front is represented ideally by a surface of discontinuity of velocity, density, temperature, and pressure gradient. |