Full Idea
Macroscopic bodies of water are complex and dynamic congeries of different molecular species, in which there is a constant dissociation of individual molecules, re-association of ions, and formation, growth and disassociation of oligomers.
Clarification
'Oligomers' are chains of molecules
Gist of Idea
Water continuously changes, with new groupings of molecules
Source
Robin F. Hendry (Chemistry [2008], 'Micro')
Book Reference
'Routledge Companion to Philosophy of Science', ed/tr. Psillos,S/Curd,M [Routledge 2010], p.523
A Reaction
The point is that these activities are needed to explain the behaviour of water (such as its conductivity).