In physics, a perfect fluid or ideal fluid is a fluid that can be completely characterized by its rest frame mass density ρ m {\displaystyle \rho _{m}}...

compressibility are called perfect fluids. Matter Liquid Gas Supercritical fluid "Fluid | Definition, Models, Newtonian Fluids, Non-Newtonian Fluids, & Facts". Encyclopedia...

context of perfect fluids. Finally, there are proposals for extension of the energy conditions to spacetimes containing non-perfect fluids, where the...

a fluid. In astrophysics, fluid solutions are often employed as stellar models, since a perfect gas can be thought of as a special case of a perfect fluid...

In cosmology, the equation of state of a perfect fluid is characterized by a dimensionless number w {\displaystyle w} , equal to the ratio of its pressure...

gravitation for the Friedmann–Lemaître–Robertson–Walker metric and a perfect fluid with a given mass density ρ and pressure p. The equations for negative...

in all directions regardless of location. A perfect fluid has no viscosity; the pressure of a perfect fluid is proportional to its density.: 49  These...

gravitation, particularly general relativity, a static spherically symmetric perfect fluid solution (a term which is often abbreviated as ssspf) is a spacetime...

star should be a perfect fluid or dust rather than a vacuum, and then argues that there exist no asymptotically flat rotating perfect fluid solutions in general...

c^{2}} and it is negative. Let us assume a static, spherically symmetric perfect fluid. The metric components are similar to those for the Schwarzschild metric:...

u_{a}} is the fluid's 4-velocity vector field, and p {\displaystyle p} is the pressure. Non-interacting dust ( a special case of perfect fluid ): T a b =...

(for example, if the stress–energy tensor is chosen to be that of the perfect fluid, a spherically symmetric solution can serve as a stellar model) Alternatively...

In fluid mechanics, hydrostatic equilibrium, also called hydrostatic balance and hydrostasy, is the condition of a fluid or plastic solid at rest, which...

reference. It has a direct physical interpretation. In the case of a perfect fluid this component is T 00 = ρ   , {\displaystyle T^{00}=\rho ~,} where...

each blob of fluid being provided by the pressure of surrounding fluid) counteracts the Raychaudhuri scalar, which for a perfect fluid in four dimensions...

density of a perfect fluid that has positive mass density but vanishing pressure. Dust solutions are an important special case of fluid solutions in general...

Lambdavacuum solution and the second term is characteristic of a pressureless perfect fluid or dust solution. The cosmological constant is carefully chosen to partially...

(1986). "Self-similar spatially homogeneous cosmologies: orthogonal perfect fluid and vacuum solutions". Class. Quantum Grav. 3 (6): 1105–1124. Bibcode:1986CQGra...

immersed in a fluid subject to an ambient gravitational field. If a bullet has neutral buoyancy when it is at rest in a perfect fluid and then it is...

physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids – liquids and gases. It has several...

Robert R. Caldwell in 1999. In cosmology, the equation of state of a perfect fluid is given by p = w ρ , {\displaystyle p=w\rho ,} where p is the pressure...

flaws. A perfect fluid would be one that is incompressible and non-viscous; this is an ideal fluid that does not exist in nature. A perfect gas would...

energy", and in this region p = −ρ . Surrounding it is a thin shell of perfect fluid where p = ρ . On the exterior is true vacuum, where p = ρ = 0 . The...

In general relativity, the Wahlquist fluid is an exact rotating perfect fluid solution to Einstein's equation with equation of state corresponding to constant...

materials. What we try to achieve by means of these materials is a perfect fluid lubrication, or a lubrication such that it is possible to avoid direct...

Pascal's law, a law of hydrostatics is developed, stating that, in a perfect fluid, the pressure exerted on it anywhere is transmitted equally. Dr Thomas...

In fluid dynamics, the Euler equations are a set of partial differential equations governing adiabatic and inviscid flow. They are named after Leonhard...

Universe as composed of non-interacting constituents, each one being a perfect fluid. If a particle is moving at a constant velocity in a non-expanding universe...

Einstein field equation is static, but this is certainly not true for perfect fluids. The extension of the exterior region of the Schwarzschild vacuum solution...

each line can be synchronized; the behavior resembles an expanding perfect fluid,: 175  general relativity that relates the geometry of spacetime to...