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Reference.org
Percus–Yevick approximation
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<p>In <a href="/facts/Statistical_mechanics/6zMsNYYG">statistical mechanics</a> the Percus–Yevick approximation is a <a href="/facts/Closure_(mathematics)/Ct6r2fJz">closure</a> relation to solve the <a href="/facts/Ornstein%25E2%2580%2593Zernike_equation/FBUedwnW">Ornstein–Zernike equation</a>. It is also referred to as the Percus–Yevick equation. It is commonly used in fluid theory to obtain e.g. expressions for the <a href="/facts/Radial_distribution_function/zWN3v1Cr">radial distribution function</a>. The approximation is named after <a href="/facts/Jerome_K._Percus/tfCdIvCL">Jerome K. Percus</a> and George J. Yevick. </p>