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Reference.org
Virial coefficient
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<p>Virial coefficients B i {\displaystyle B_{i}} appear as coefficients in the <a href="/facts/Virial_expansion/BqAnLSNj">virial expansion</a> of the pressure of a <a href="/facts/Many-particle_system/n2rIxgwv">many-particle system</a> in powers of the density, providing systematic corrections to the <a href="/facts/Ideal_gas_law/Pphokwhf">ideal gas law</a>. They are characteristic of the interaction potential between the particles and in general depend on the temperature. The second virial coefficient B 2 {\displaystyle B_{2}} depends only on the pair interaction between the particles, the third ( B 3 {\displaystyle B_{3}} ) depends on 2- and non-additive 3-body interactions, and so on. </p>