Liquid water (image 2 of 3). Molecular graphic of the structure formed by liquid water. Water mole- cules have one oxygen atom (light blue) & 2 hydro- gen atoms (white). Each molecule is neutral, but the oxygen has a small negative charge & the hydro- gens are slightly positive. The hydrogens are attracted to oxygens in nearby molecules, forming weak hydrogen bonds (dark blue). Between 0 and 100 degrees celsius, the molecules have enough thermal energy to break some of the hydrogen bonds. Water therefore forms a fluid which is a mixture of bonded clusters and individual molecules. (See also A504/062 for ice & A504/064 for water vapour).