. . . "\\(\\vartheta = \\frac{\\Delta V}{V_0}\\), where \\(\\Delta V\\) is the increase in volume and \\(V_0\\) is the volume in a reference state to be specified."^^ . . . . . . . . "Volume, or volumetric, Strain, or dilatation (the relative variation of the volume) is the trace of the tensor \\(\\vartheta\\)."^^ . . "Volume Strain"@en . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31889"^^ . . "\\(\\vartheta\\)"^^ . . "http://en.wikipedia.org/wiki/Deformation_(mechanics)"^^ .