What is the equation of the state?

In thermodynamics, the equation of the state (EOS) is a mathematical expression that describes the interconnection between the variable state - generally macroscopically observable and measurable properties - for a particular condition. This condition can be solid, liquid, gas or plasma. Observable or properties used in the equation of the state may change by theorist, but generally completely describe the condition. For example, the equation for the "n" moth of the ideal gas can be completely described by means of an equation pv = nrt, where p = pressure, v = volume, r = ideal gaseous constant and t = temperature. Note that EOS is to describe no more than one condition, whether this condition is solid, liquid or gas. These terms include an atomic volume that deducts the total volume and intermolecular force that affects the distance between particles. Even these adjustments may not be enough. Viral mathematical terms and iterative computational methods may be required to match the equation with the measured data to be explained. Such terms of dark intellectual interpretation,But they improve practical application.

The acceptable equation of the state may be difficult to derive for liquid systems because they experience a much greater degree of molecular interaction due to the fact that the molecules are much closer to each other than for gases. Liquids are categorized on the basis of the size of such interactions as not association or as an association. Most of London's dispersion forces are relatively weak, and if the only intermolecular forces present are, liquid-free oil or other hydrocarbon-not association. If, the molecules are thicker, as for hydrogen -linked molecules, the liquid is connected. The stronger the power, the more complicated the mathematical modeling and the corresponding equation of the state.

For the development of an acceptable equation of the state, liquids can be assigned, which are considered more resembling solids than association liquids. Some scientists use a model involving a two -dimensional grid,This suggests that the association of liquids has at least some solid properties. The lattice, which is rather two -dimensional than three -dimensional, indicates that the firm behavior component is limited. Since some particles are not considered part of the grid, the name assigned to this model for fluids-no gas or liquid-is the theory "grid-gas". Mathematics of liquid equations of grid-hill can be contrainuitive and complex, as polymer-in-salvent systems illustrate.