Equation of state

Virial equation of state Benedict, Webb & Rubin Redlich-Kwong equation Soave equation (modified Redlich-Kwong) Peng-Robinson equation Several equations of state are simply (empirical or arbitrary) adjustments of already existing equations.

Equation of State - The relationship among pressure, density, and temperature for a gas or fluid. The ideal gas law, for which pressure is proportional to the product of temperature and density, is an example of an equation of state ...

Equation of State (a) A relation between the pressure, temperature, and density of a fluid. [H76] (b) An equation that describes a relationship between the energy, pressure, and density of a quantity of mass.

An equation of state for real gases. For one mole of gas the equation is (p + a / Vm2) (Vm - b) = RT , where p is the pressure, Vm the molar volume, and T the thermodynamic temperature.

An equation of state (for gases) is a mathematical model used to roughly describe or predict the state of a gas. At present, there is no single equation of state that accurately predicts the properties of all gases under all conditions.

The equation of state, hydrostatic equilibrium and the other physical principles are put together for each layer in a star. The equations are solved for each layer starting from the layer there is direct information of, the surface.

perfect gas A gas which has the following characteristics: (a) it obeys the Boyle-Mariotte law and the Charles-Gay-Lussac law; thus satisfying the equation of state for perfect gases; (b) it has internal energy as a function of temperature alone; ...

equation of state (NASA Thesaurus / NASA SP-7, 1965) An equation relating temperature, pressure, and volume of a system in thermodynamic equilibrium.

* 1934 - Georges Lemaître interprets the cosmological constant as due to a vacuum energy with an unusual perfect fluid equation of state ...

Each possibility described so far is based on very simple form for the dark energy equation of state. But as the name is meant to imply, we know almost nothing of the real physics of the dark energy.

The ideal gas law is the equation of state of a hypothetical ideal gas, first stated by Beno?t Paul ?mile Clapeyron in 1834.

The Hubble observations, combined with earlier data, promise to help astronomers refine the mathematical description -- called the equation of state -- of the complex transformations matter undergoes at extraordinary densities not found on Earth.

"Our results are really starting to put the squeeze on the neutron star equation of state," said Villarreal. "It looks like equations of state which predict either very large or very small stars are nearly excluded.

Density of water is calculated from in situ measurements of conductivity (salinity), temperature and pressure. An equation called the equation of state of water relates the measurements so that density can be found if these other three values are ...

The main purpose of the SKA is to study large-scale structure and galaxy evolution. SKA will detect neutral hydrogen at high redshifts and find the universe's Equation of State, which gives astronomers a relation between dark energy and cosmic time.

latent heat, heat of vaporization, kinetic theory of gases, ideal gas, gas laws, vapor pressure, deposition, frost, greenhouse gas, troposphere, air, latent heat flux, microwave radiometer, Gibbs free energy, Gibbs phase rule, equation of state.

See also: Density, Temperature, Energy, Model, Pressure