ABSTRACT
Water and air are necessary for all life and therefore for all animal and
vegetable products; they are the main constituents of many materials.
Water can dissolve more chemical compounds than any other solvent
and is used a great deal in the painting industry. Water is essential in
concrete even though much of it evaporates as part of the setting
process. Air is also an important component in the chemical processes
required for the setting of most concretes. It is also the essential
constituent of insulation materials. The majority of industrial processes
also use great amounts of water for cooling, cleaning, etc.
