
Review of Short Phrases and Links 
This Review contains major "Compressibility" related terms, short phrases and links grouped together in the form of Encyclopedia article.
Definitions
 Compressibility is a description of the amount of change of density in the problem.
 Compressibility is an important factor in aerodynamics.
 Compressibility is a geological term used to quantify the ability of a soil to reduce in volume with applied pressure.
 Compressibility is a physical property of every gas.
 Compressibility is used in the Earth sciences to quantify the ability of a soil or rock to reduce in volume with applied pressure.
 The Boussinesq approximation neglects compressibility except to calculate buoyancy forces.
 Description of such phenomena requires more general presentation of the NavierStokes equation that takes into account fluid compressibility.
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 All of these effects are often mentioned in conjunction with the term "compressibility", but in a manner of speaking, they are incorrectly used.
 For a real fluid, however, viscosity, elasticity (the reciprocal of compressibility), and turbulent properties are also important.
 For this reason it's common to see references to aircraft that suffer from compressibility.
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 In solving a subsonic problem, one decision to be made by the aerodynamicist is whether to incorporate the effects of compressibility.
 Because the effects of compressibility are directly related to the speed of sound, a ratio is used to describe the speed of an aircraft.
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 Transonic compressibility drag increases significantly as the speed of flight increases towards Mach 1.0, dominating other forms of drag at these speeds.
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 One of the simplification methods used in the past was to assume that the gas was very low speed and to neglect the effects of compressibility.
 However, two very important factors are the viscosity of the fluid and the compressibility of the fluid.
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 The low compressibility of nongases, and of water in particular, leads to them often being assumed as incompressible.
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 Soil mineralogy controls the size, shape, and physical and chemical properties of soil particles and thus its loadcarrying ability and compressibility.
 The inverse of the compressibility is called the bulk modulus, often denoted K (sometimes B). That page also contains some examples for different materials.
 It is now possible to model the compressibility of the lubricant in such a way that the densitypressure relation is realistic through out the contact.
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 An equation gives a factor to be applied to that prediction to allow for the effect of compressibility at higher Mach numbers.
 Note that for an ideal gas, z = 1 and the real "compressibility" equation reduces to the ideal gas law.
 One reason is the importance of the compressibility of air at these speeds.
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 The compressibility of the air becomes a factor when the air enters the intake port around the intake valve.
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 The compressibility of water is a function of pressure and temperature.
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 The correlation of the compressibility factor as a function of temperature and pressure was the basis to obtain an equation for dry air specific volume.
 The model should provide reasonable accuracy near the critical point, particularly for calculations of the Compressibility factor and liquid density.
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 A compressibility factor of one also requires the four state variables to follow the ideal gas law.
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 The calibration equation (see calibrated airspeed) accounts for compressibility, but only at standard sea level pressure.
 The expansion factor, Y, accounts for the compressibility of gases.
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 The compressibility factor, Y, accounts for the expansion of compressible gases; it is 1.0 for incompressible fluids.
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 The air is displaced by the liquid metal in a very rapid manner, in a matter of milliseconds, therefore the compressibility has to be taken into account.
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 The density and compressibility of air are important factors at high speeds.
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 When the effects of compressibility on the solution are small, the aerodynamicist may choose to assume that density is constant.
 Also significant are the related aspects of density and compressibility.
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 The students on the course were familiar with the basics of fluid dynamics, but had little prior knowledge of the effects of compressibility.
 CAS  calibrated airspeed  indicated airspeed corrected for air density and compressibility.
 The next term,, describes stretching of vorticity due to flow compressibility.[2] Sometimes the negative sign is included in the term.
 Alternatively, tests could be conducted in a water tank instead of in air (provided the compressibility effects of air are not significant).
 However, compressibility effects are more frequently encountered in gas flows than in liquid flows.
 This compressibility effect alters the amount of resulting force on the aircraft.
 Effects of compressibility: Prandtl Glauert rule; shock waves on wings and bodies; effect of sweep on twodimensional wings.
 Blade element theory.Effect of viscosity and compressibility.
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 Thermodynamicists use this factor (Z) to alter the ideal gas equation to account for compressibility effects of real gases.
 It is worked out by correcting the aircraft's indicated airspeed for altitude, temperature, position error and compressibility effects.
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 In air, compressibility effects can be ignored when the Mach number in the flow does not exceed 0.3.
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 This is in large part due to the density, viscosity, and compressibility of liquids.
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 Volume viscosity (also called bulk viscosity or second viscosity) becomes important only for such effects where fluid compressibility is essential.
 As the speed of sound in a fluid is the, the peak pressure will depend on the fluid compressibility if the valve is closed abruptly.
 Fluids vary with regard to compressibility, depending on whether the fluid in question is a liquid or a gas.
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 The viscosity, density, and compressibility of a fluid are the properties that determine how the liquid or gas will flow.
 The viscosity, density, compressibility, and temperature of the air determine how the air will flow around a building or a plane.
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 Solids, liquids and gases are ideal behaviours characterised by properties such as compressibility, viscosity, elasticity, strength and hardness.
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Compressibility
 A compressible flow is a situation in which the compressibility of a fluid must be taken into account.
 The term is applied commonly to the study of the mechanical properties of water, other liquids, and even gases when the effects of compressibility are small.
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 The properties of fluids include density, the mass per unit volume, and compressibility, which is high for gases but essentially zero for liquids.
Categories
 Physics > Thermodynamics > Gases > Viscosity
 Compressible
 Information > Science > Physics > Fluid
 Different Materials
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