What is Compressible Fluid?
Every fluid we encounter in our daily lives is compressible. To understand what compressible fluids is one must first understand what compressibility is. The compressibility of a fluid is the reduction of the volume of the fluid due to external pressures acting on it. A compressible fluid will reduce its volume in the presence of an external pressure. The quantitative measurement of the compressibility is taken as the relative volume change of the liquid in response for a pressure change. The compressibility is denoted with a β or a κ. The compressibility is defined mathematically as κ =(-1/v) ∂V/∂p, where V is the volume and p is the pressure. In reality, every gas is highly compressible, but liquids are not highly compressible. Compressibility is defined in two forms. The adiabatic compressibility describes the compressibility of the system when the temperature of the system is constant. This is denoted by βV. The isothermal compressibility refers to the compressibility measured under no energy transfer between the system and the surroundings. This is denoted by βS. Since an adiabatic process is also isentropic, this process is a constant entropy process.
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