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Water(h 2 0)is a liquid at room temperature, is odorless,
tasteless, has a blush tint which may be detected; however, only in
layers of significant depth. The freezing point of water is 0
degrees Celsius(32 degrees Fahrenheit), and its boiling point is 100
degrees Celsius(212 degrees Fahrenheit). Water attains its maximum
density at a temperature of 4 degrees Celsius(39 degrees Fahrenheit)
and expands upon freezing.
Water is one of the best known ionizing agents. Because most
substances are somewhat soluble in water, it is frequently stated as
the universal solvent. Water combines with certain salts to form
hydrates. Water also reacts with metal oxides to form acids. It acts
as a catalyst in many important chemical reactions.
Water is the only substance now known to man, that can occur at
ordinary temperatures in all three states of matter, that is, as a
solid, a liquid, and as a gas.
As a solid, or ice, it is found as glaciers, and ice caps, on
water surfaces in winter, as snow, hail and frost, and as clouds
formed of ice crystals.
Water occurs in the liquid state as rain clouds formed of water
droplets, and on vegetation, or otherwise dew; in addition it covers
three covers of the surface of the earth in the form of swamps,
lakes, rivers, streams, ponds, oceans, etc.
As a gas, or in other words water vapor. It occurs as fog,
steam, and clouds. Atmospheric vapor is measured in terms of
relative humidity, which is the ratio of the quantity of vapor
actually present to the greatest amount possible at a given
Life and Water
Water is a major constituent of living matter. From 50 to
90 percent of the weight of...