Size and structure of molecular clusters in supercritical water

The type and topology of hydrogen-bonded molecular clusters of water are in vestigated by the molecular dynamics method for five models of water in sup ercritical conditions, Small clusters (of the order of 10 molecules) are pr esent in all models, even at densities of less than 0.2 g/cm(3). When the d ensity increases, a phase transition occurs from vapor-like to fluid-like s tate. Among small clusters, linear structures are predominant.