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The 27 pages that link to Ideal gas, each with the reason it gives.

• Equation of stateCompared with: The ideal-gas model defines the assumptions behind the simplest gas equation of state.

• Kinetic theory of gasesCompared with: It is the limiting case in which the simplest kinetic assumptions apply.

• Internal energyBroader topic: An ideal gas’s internal energy depends only on temperature.

• Mach numberRelated: For an ideal gas, temperature and composition help determine the sound speed.

• Stellar structureCompared with: It approximates many stellar layers but fails where degeneracy or strong interactions matter.

• Activity coefficientCompared with: For an ideal gas, pressure directly tracks activity and the fugacity coefficient is one.

• Joule–Thomson effectCompared with: An ideal gas has no Joule–Thomson temperature change because enthalpy depends only on temperature.

• Van der Waals equationCompared with: Van der Waals modified this idealization to account for real molecular behavior.

• Real gasCompared with: It supplies the limiting model that real gases depart from.

• Equipartition theoremRelated: Translational quadratic terms yield the ideal gas’s classical internal energy.

• Maxwell–Boltzmann distributionRelated: Its classical equilibrium behavior is the standard setting for the distribution.

• FugacityCompared with: For an ideal gas, fugacity equals pressure exactly.

• Otto cycleRelated: The standard air-cycle analysis treats the working fluid as an ideal gas.

• Grand canonical ensembleBroader topic: Its grand partition function gives a direct description of fluctuating particle counts.

• Microcanonical ensembleBroader topic: Its microcanonical state count can be calculated explicitly and yields familiar thermodynamics.

• Maxwell–Boltzmann statisticsRelated: Its molecular energies follow Maxwell–Boltzmann statistics in the classical regime.

• Collision theoryNarrower topic: The simplest collision-theory calculations use ideal-gas assumptions about particle motion.

• Charles's lawNarrower topic: The law is exact for this model and approximate for real gases.

• Gibbs paradoxNarrower topic: The paradox is most clearly derived using ideal gases.

• Photon gasCompared with: Unlike an ordinary ideal gas, a photon gas has no conserved particle number.

• Isentropic processRelated: Ideal-gas assumptions yield simple equations for isentropic changes.

• Superheated steamRelated: Superheated steam can often be approximated as an ideal gas at sufficiently low pressure and high temperature.

• Amagat's lawRelated: Ideal-gas assumptions make the additive volume rule exact for mixtures.

• Stirling cycleRelated: Ideal Stirling-cycle calculations commonly model the working gas with this equation of state.

• Classical statistical mechanicsBroader topic: Its equation of state follows from a simple statistical treatment of particle motion.

• Interactions in fluidsCompared with: It provides a limiting case where intermolecular forces are deliberately omitted.

• Internal pressureCompared with: Its internal energy depends only on temperature, so its internal pressure is zero.