A water droplet has structural integrity because of attractive forces between water molecules. If the molecules get close enough, however, the intermolecular forces are repulsive; water molecules can pack only so tightly. In quantum systems, intrinsically quantum fluctuations can stabilize a cluster of atoms against collapse. As a result, quantum droplets can have extraordinarily low densities.
Using Bose-Einstein condensates, researches created liquids that have extraordinarily low densities - five orders of magnitude below that of an ideal gas at room temperature and pressure.
Journal article:http://science.sciencemag.org/content/early/2017/12/13/science.aao5686
Source:http://physicstoday.scitation.org/do/10.1063/PT.6.1.20180111a/full/
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