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The chemical formula for water is H2O – two hydrogen atoms covalently bonded to one oxygen atom. The shape of the molecule and the distribution of electrons in this molecule means it is polar, with the oxygen slightly negative and the hydrogen atoms slightly positive. As a result water molecules are held together by hydrogen bonds. It is the effect of these bonds which makes water liquid at room temperature and the perfect medium for life. After all, it makes up 60-70% of your body!
Water is a polar molecule.
Sweating is a vital cooling mechanism in mammals.