Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-03-23
Physics
Condensed Matter
Soft Condensed Matter
28 pages, 8 figures
Scientific paper
Water is commonly associated to the existence of life. However, there is no clear reason why water should be the only liquid in which life could form and survive. Since the seminal work of L. J. Henderson in 1913, scientists are trying to answer the question about the relation between the unusual properties of water and the existence of life. Here we follow the first steps along the challenging path to this answer, trying to understand (i) what is unusual about water; (ii) why water has anomalies; (iii) which are the full implications of these unusual properties; and (iv) if these anomalies are exclusive properties of water. By identifying some interesting clues, then by formulating a working hypothesis and, next, by testing it, we find the surprising results that some properties of water, such as the anomalous behavior of density, are very sensitive to small changes of the microscopic interactions, while others, such as the presence of more than one crystal or a possible phase transition between two liquids with different local structures, are predicted not only in water, but also in other liquids. Since the change of local liquid structure could be relevant in biological processes, the possibility of a wide class of liquids with this property could help in understanding if water is essential for life.
Franzese Giancarlo
Stanley Eugene H.
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