The answer ; double, single
In unsaturated oils, the double bonds cause the hydrocarbon chains to have kinks hence do not allow adjacent hydrocarbon chains to form enough hydrogen bonds between each other. Therefore, chains are not compact enough even at low energetic levels (at room temperature).
In saturated oils, the single-bond hydrocarbon chains have numerous hydrogen bonds between adjacent chains that they become compact at room temperature (when their molecules have low energy levels)
