. "\\(\\varphi = -(M_A\\sum b_B)^{-1} \\ln a_A\\), where \\(M_A\\) is the molar mass of the solvent \\(A\\), \\(\\sum\\) denotes summation over all the solutes, \\(b_B\\) is the molality of solute \\(B\\), and \\(a_A\\) is the activity of solvent \\(A\\)."^^ . "The \"Osmotic Coefficient\" is a quantity which characterises the deviation of a solvent from ideal behavior." . "http://www.iso.org/iso/catalogue_detail?csnumber=31894"^^ . "\\(\\varphi\\)"^^ . "http://en.wikipedia.org/wiki/Osmotic_coefficient"^^ . . . . "Osmotic Coefficient"@en .