These properties become even more pronounced at the nanoscale, where the fraction of the undercoordinated molecules increases with the surface curvature. The intriguing phenomena of water droplets are associated with skin density loss. According to XRD measurements , the skin O-O separation is 5.9% longer than its bulk value of 2.8 (should be 2.7) Å or 15.6% density loss at 298 K in comparison to the 4.6% skin O-O length contraction of the liquid methanol.