Safe Drinking Water
Pakistan & Gulf Economist 2011, April 3, 30, 13
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- 2,99 €
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- 2,99 €
Description de l’éditeur
Byline: DR. S.M. ALAM Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on earth with its solid state, ice, and gaseous state, water vapor or steam.