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Did
you know?
Reverse osmosis is the finest water filtration method known. This process will
allow the removal of particles as small as ions from a solution. It is used
to purify water and remove salts and other impurities in order to improve the
color, taste or properties of the fluid. R.O. uses a membrane that is semi-permeable,
allowing the fluid that is being purified to pass through it, while rejecting
other ions and contaminants from passing.
This technology uses a process
known as crossflow to allow the r.o. membrane to continually clean itself. This
is the reason of why an r.o. element can last many years before clogging or
need replacement. This
water purification process requires a driving force to push the fluid through
the membrane, and the most common force is household water pressure or pressure
from a booster pump. The higher the pressure, the larger the driving force and
efficiency.
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WATER AND THE HYDROLOGIC CYCLE
Water
begins its never ceasing cycle as vapor in the atmosphere. This vapor
in the atmosphere, as well as the water in the lakes and oceans, provides
protection against extremes of both heat and cold.
Hydrologic
cycle. This term, or the more common one "water cycle," refers
to the complete sky-to-earth-to-sky circuit pursued by water in nature.
It includes water's precipitation as rain, snow, hail or dew; its journey
over, around and through obstacles above, on and below the earth's surface
and its eventual evaporation and return to the atmosphere. It is the
largest water purification system known to man.
Scientists estimate
that the sun converts matter into energy at the rate of 250 million tons
per minute. Even though the earth receives only a token portion of this
heat energy (less than one two-billionth part), everything here would
burn to a crisp were it not for the fact that the water above and on the
earth in large bodies of water absorbs most of the heat.
In a large desert, for
example, there is but a small amount of water. Consequently, there are
wide extremes in the heat. The Sahara Desert typifies this condition.
There under the sun's penetrating rays temperatures rise to 125 ° during the daytime and fall below freezing at night.
In the atmosphere the
various substances do not combine chemically. Instead each retains its
own characteristic properties.
The
make-up of the atmosphere. The composition of the troposphere (the layer
closest to the earth) has been calculated to be nitrogen, 78.09 percent;
oxygen, 20.95 percent; argon, 0.93 percent; carbon dioxide, 0.03 percent;
together with minute amounts of neon, krypton, helium, hydrogen, xenon
and ozone. In addition to these gases, the atmosphere contains varying
percentages of water vapor. About 9/10 of the mass of the atmosphere
lies within ten miles of the earth's surface. The above figures are
composition by volume.
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