ABSTRACT
Water and air are needed for all life and therefore for all animal and vegetable products; they are the constituents of many materials. Water can dissolve more chemical compounds than any other solvent and is used a great deal in the painting industry. When casting concrete, water is always part of the mixture, even if it evaporates as part of the setting process. Air is also an important component in the chemical processes required for the setting of concrete. The majority of industrial processes also use great amounts of water for cooling, cleaning etc.
