(5) Biologocial function of water (basis of life, the content of water is greater in youth and at lower level of
the Darwin’s range, photosynthesis, transpiration, evaporation);
(6) Chemistry of water (Lavoisier, Cavendish, Gay-Lussac, Humboldt);
(7) Water in physics (clear colourless liquid, without taste and smell, freezing point 0ºC, bowling point 100ºC,
anomality of water-increasing of the volume by freezing of 1/11, salinity).
3.3.2.3 Ecology
1/5 of people has not an accession to unexceptionable water, 2.6 mld of people has not a basic hygienic
background (http://www.un.org/events/water/factsheet.pdf).