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Extensions can take many forms. These are the most common
types of extensions. The original definition is included in
brackets followed by the extension. Further definition, use further definition
when you need to define terms you used in your original definition. >> In water softening, zeolite is an
exchange resin that releases sodium ions while gaining calcium and magnesium ions. Zeolite is a collection of small
polystyrene beads that forms a resin carrying a negative charge. >> Comparison and contrast,
use comparison and contrast when you need to show
differences or similarities. >> In water softening, zeolite is
an exchange resin that releases sodium ions while gaining calcium and
magnesium ions. Zeolite collects calcium and magnesium ions in the same way
a feather broom collects dust. >> Classification, use classification when you need to
organize information into categories. >> In water softening, zeolite is
an exchange resin that releases sodium ions while gaining calcium and
magnesium ions. Zeolite is used for ion-exchange
home water softening, while lime and soda ash are used in precipitating
municipal water softeners. >> Cause and effect, use cause and
effect when you need to demonstrate why something happens or
when you need to trace results. >> In water softening,
zeolite is exchange resin that releases sodium ions while
gaining calcium and magnesium ions. Zeolite carries a negative charge and attracts the positively charged
calcium and magnesium ions in water. >> Process, use process when you need
to list the steps of a procedure. >> In water softening,
zeolite is an exchange resin that releases sodium ions while gaining calcium and
magnesium ions. First, the zeolite is charged with sodium
ions from a salt brine solution in the regeneration step. Once charged, the zeolite absorbs
calcium and magnesium ions from passing hard water while releasing sodium
ions into the resulting soft water. >> Exemplification, use exemplification
when you need to give real or analogous examples. >> In water softening, zeolite is an
exchange resin that releases sodium ions while gaining calcium and magnesium ions. Examples of the zeolite group include
analcimes, chabazites, and gismondines. >> Etymology, use etymology to show
the linguistic genesis of the term. >> In water softening,
zeolite is an exchange resin that releases sodium ions while gaining calcium and
magnesium ions. The term zeolite comes from the Greek
words zeon, meaning to boil, and lithos, meaning stone. It was first coined by the Swedish
mineralogist Alex Fredrick Cronstedt in the 18th century. >> In some situations you may need to
sacrifice desired precision in your definition to achieve the desired
level of communication. At times, for example,
it is not a good idea to try to achieve expert level precision
with an uninformed audience. Consider the following two
definitions of a black hole, the astrophysical phenomenon that is
supposed to exist somewhere in space. Definition 1. >> In astrophysics, a black hole
is a set of events from which it wasn't possible to escape
to a large distance. A black hole gets its name from its
boundary, called an event horizon, which is formed by the paths in space-time
of rays of light that just fail to get away, hovering instead
forever on the edge. And, consequently, moving path
parallel to and away from one another. >> Definition 2. >> In astrophysics, a black hole is a
collapsed neutron star whose gravity is so great that even light can't escape. Although fusion reactions within this
collapsed star still may emit brilliant rays of light,
when it is viewed from the outside, the black hole appears to be
a totally dark void in space. >> Definition 1 functions
at the expert level. For theoretical physicists,
it provides a precise and accurate description of a black hole,
and thus is appropriate for their needs. But for the less informed reader,
it represents a mind twisting experience that in many cases can leave readers
more confused about the term, than they were before they read it. Definition 2 functions at
the level of the average reader. It is not nearly as precise or
accurate as the first definition, but it communicates the basic gist of what
constitutes a black hole in space. The problem is that, to be precisely
correct and absolutely accurate, you would have to function
at a level where you cannot effectively communicate
with the average reader. If you were writing for average reader,
you would have to make a decision here. Either be absolutely correct and
communicate less effectively, or be less than absolutely correct and
communicate more effectively. Since your goal is effective
communication, your decision is obvious.

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