[ajax0604]

I understand that when equal volumes of water and ethanol are mixed, the resulting volume is less than the combined volumes of the two liquids but I was wondering if there was a situation where the resulting volume is MORE than the combined volumes. For example, if propanol was mixed with water? 

[Rutherford]

I don't think so. If no significant force can form between the molecules of the two liquids, then they just won't mix, and two phases will be produced. In that case the final volume is just a sum of the volumes of the liquids.

[sjb]

I understand that when equal volumes of water and ethanol are mixed, the resulting volume is less than the combined volumes of the two liquids but I was wondering if there was a situation where the resulting volume is MORE than the combined volumes. For example, if propanol was mixed with water?

http://www.docentes.ipt.pt/valentim/ensino/thermodynamics_11.ppt (slide 23)‎ suggests that tetrachloroethylene / cyclopentane behave like this.