Real gas

The real gas is in thermodynamics, the " realistic " counterpart of the ideal gas. Whereas the ideal gas consists of particles which have no stretch ( point mass) and interact with each other only through elastic collisions, this idealization is not carried out at real gases: among them is considered that actual gas molecules or atoms have an extension, and that this gas particles where appropriate, the shocks also interact with each other, eg by van der Waals forces.

These interactions can take the Lennard -Jones potential, the compressibility factor and, inter alia, also be described by the Joule- Thomson coefficient in approximate approximation. To prevail at a great distance the attractive forces, however, starts from the falls below a certain distance of two particles to each other the repulsive (repulsive ) to predominate force component which increases extremely fast ( with r12 or exponential).

If there is no very great accuracy is required, one is content usually associated with the van der Waals equation to describe the state of a real gas. However, there are a variety of other equations of state:

  • Virialgleichungen
  • Clausius equation
  • Equation of state of Dieterici
  • Redlich - Kwong equation of state
  • Redlich - Kwong equation of state of Soave -
  • Equation of state of Peng -Robinson
  • Equation of state of Benedict - Webb - Rubin
  • Equation of state of Berthelot
  • Thermodynamics
Elasticity Lennard-Jones-Potential Exponential decay Thermodynamic state
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