What know we today about water:
since the end of the XVIII th century, the chemical nature of water is known.
Antoine Lavoisier, who was later guillotined during the French Revolution, showed the structure of water formed by oxygen and hydrogen.
Today we know with great precision the OH bonds and their length, as well as the angle formed by the atoms, the parameters and the binding energies that allow us to accurately assess the H2O molecule and its chemical characteristics. We also know all the anomalies of water, which sometimes has unpredictable and inexplicable behaviour. The most well known of these, for example, is the fact that its internal order grows increasing pressure.
In fact, the solid state of ice is more ordered that the the liquid phase but is less dense, this phenomenon causes the floating of ice.
The boiling temperature of water is higher than expected according to its chemical properties compared with those of other similar fluids.
There is a long list of structural abnormalities, dynamic and thermodynamic properties that make water the fluid most mysterious and fascinating of our planet even though it is the most common.
Prof. Masaru Emoto's experiments about the memory of ' water began a process of knowledge that glimpse interesting developments.