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  2. Real gas - Wikipedia

    en.wikipedia.org/wiki/Real_gas

    Real gases are non-ideal gases whose molecules occupy space and have interactions; consequently, they do not adhere to the ideal gas law. To understand the behaviour of real gases, the following must be taken into account: compressibility effects; variable specific heat capacity; van der Waals forces; non-equilibrium thermodynamic effects;

  3. Joule–Thomson effect - Wikipedia

    en.wikipedia.org/wiki/Joule–Thomson_effect

    In thermodynamics, the Joule–Thomson effect (also known as the Joule–Kelvin effect or Kelvin–Joule effect) describes the temperature change of a real gas or liquid (as differentiated from an ideal gas) when it is expanding; typically caused by the pressure loss from flow through a valve or porous plug while keeping it insulated so that no heat is exchanged with the environment.

  4. Fugacity - Wikipedia

    en.wikipedia.org/wiki/Fugacity

    For an ideal gas, fugacity and pressure are equal, and so φ = 1. Taken at the same temperature and pressure, the difference between the molar Gibbs free energies of a real gas and the corresponding ideal gas is equal to RT ln φ. The fugacity is closely related to the thermodynamic activity. For a gas, the activity is simply the fugacity ...

  5. Van der Waals equation - Wikipedia

    en.wikipedia.org/wiki/Van_der_Waals_equation

    Although ideal gases, for which = (), do not change temperature in such a process, real gases do, and it is important in applications to know whether they heat up or cool down. [ 72 ] This coefficient can be found in terms of the previously derived α {\displaystyle \alpha } and c p {\displaystyle c_{p}} as [ 73 ] μ JT = v ( α T − 1 ) c p ...

  6. Gas kinetics - Wikipedia

    en.wikipedia.org/wiki/Gas_kinetics

    Real gases are characterized by their compressibility (z) in the equation PV = zn 0 RT. When the pressure P is set as a function of the volume V where the series is determined by set temperatures T, P, and V began to take hyperbolic relationships that are exhibited by ideal gases as the temperatures start to get very high. A critical point is ...

  7. Compressibility factor - Wikipedia

    en.wikipedia.org/wiki/Compressibility_factor

    In thermodynamics, the compressibility factor (Z), also known as the compression factor or the gas deviation factor, describes the deviation of a real gas from ideal gas behaviour. It is simply defined as the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure .

  8. Joule expansion - Wikipedia

    en.wikipedia.org/wiki/Joule_expansion

    [5] [6] The inversion temperature of a gas is typically much higher than room temperature; exceptions are helium, with an inversion temperature of about 40 K, and hydrogen, with an inversion temperature of about 200 K. Since the internal energy of the gas during Joule expansion is constant, cooling must be due to the conversion of internal ...

  9. Boyle temperature - Wikipedia

    en.wikipedia.org/wiki/Boyle_temperature

    This is the virial equation of state and describes a real gas. Since higher order virial coefficients are generally much smaller than the second coefficient, the gas tends to behave as an ideal gas over a wider range of pressures when the temperature reaches the Boyle temperature (or when c = 1 V m {\textstyle c={\frac {1}{V_{m}}}} or P ...

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