Compressible flow is a branch of fluid mechanics that deals with the behavior of gases at high speeds and pressures. In compressible flow, the density of the fluid changes significantly as it moves through a system, leading to changes in other properties such as temperature, pressure, and velocity. This type of flow is often seen in aerospace engineering, supersonic aircraft, and gas dynamics applications. Researchers in compressible flow study various phenomena such as shock waves, expansion waves, and the formation of boundary layers in high-speed flows. The goal of research in compressible flow is to develop a better understanding of the complex behavior of gases at high speeds and pressures, and to improve the design and performance of systems that operate under these conditions.