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The volume changes onmixing D2O with H2O have been measured with a newtilting-type dilatometer. The molar volumes are very nearly additive, but notexactly so. At 25C, the excess molar volume Vmis positive, having a maximum value of about 1.8 x cm3 mol-1,while at4C it is negative, with aminimum of about - 1.2-4 cm3 mol-l.

Excess volumes for H2O + D2O liquid mixtures