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  1. K

    What does O represent in the virial expansion F = F0 + kBT log c + ½ cb1 + O(c²)?

    Please, This equation is based on the free energy of perfect gaz : F = F0 + kBT log c + ½ cb1 + O (c2) ½ cb1 is the excluded volume term (c is the concentration) but what is O ?
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