The Absorption reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Absorption

In optics, absorption is the process by which the energy of a photon is taken up by another entity, for example, by an atom which makes a transition between two electronic energy levels. The photon is destroyed in the process.

Absorption can be measured by spectroscopy.

Molecules can lose absorbed energy by heat and radiation.

See also

• Beer-Lambert law
• Absorption spectrum

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