Natures

For one thing, water is wet, but H2O molecules are not. The usual response is that wetness is an emergent property, which is the scientificalistic way of saying "then a miracle happens." In Aristotelian categories, the powers of a thing stem from itsform. That is, sodium and chlorine atoms consist of the same parts, but their properties differ because of the number and arrangement of those parts. The first thing to note is that a piece of water is not composed exclusively of H2O molecules.
"It is simply false," says Brandon, "to say that the essence of water is H2O. In liquid water there are H3O+ and OH- ions, which are absent from water vapor; in water vapor there are H4O2 and other H2O polymers that are not always found in liquid water. The microstructure of water actually depends on the context." And if we note further that an electron in a valence orbit behaves differently than a free electron, we realize that context matters.

http://tofspot.blogspot.co.uk/2013/05/bats-in-belfrey.html