

Equation of state Summary 
  An equation of state is a quantitative relationship among the variables that determine the state of a given system, that is, whether it is solid, liquid, or vapor, its enthalpy or heat content, etc. The state of a system is its condition or situation, at a given instant, and is determined by its properties. 
  Equations of state are useful in describing the properties of fluids, mixtures of fluids, solids, and even the interior of stars. 
  The Elliott, Suresh, and Donohue (ESD) equation of state (EOS) was proposed in 1990. 
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