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The Epic Interactive Encyclopedia 1997
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absorption
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1992-09-02
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21 lines
In science, the taking up of one substance by
another, such as a liquid by a solid (ink by
blotting-paper) or a gas by a liquid (ammonia
by water). In biology, absorption describes
the passing of nutrients or medication into
and through tissues such as intestinal walls
and blood vessels. In physics, absorption is
the phenomenon by which a substance retains
radiation of particular wavelengths; for
example, a piece of blue glass absorbs all
visible light except the wavelengths in the
blue part of the spectrum; it also refers to
the partial loss of energy resulting from
light and other electromagnetic waves'
passing through a medium. In nuclear physics,
absorption is the capture by elements, such
as boron, of neutrons produced by fission in
a reactor.
Subject by: Russell Webb