Acoustics is the branch of physics that deals with the study of sound and its behavior in various mediums.

The conservation of mass, also known as the law of mass conservation, is a fundamental principle in physics and chemistry.

Fluid is a state of matter in which particles are free to move and flow.

Fluid dynamics is the branch of physics that studies the motion of fluids, including liquids, gases, and plasmas.

A jet engine, also known as a jet propulsion system, is a type of internal combustion engine that produces thrust by ejecting a high-speed jet of exhaust gases.

Lev Landau was a prominent Soviet physicist who made significant contributions to various areas of theoretical physics.

The Navier-Stokes equations are a set of partial differential equations that describe the motion of fluid substances, such as liquids and gases.