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A graphic representation of a spectrum.
[spectro- + G. gramma, something written]
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However, there are many differences between optical and acoustic spectroscopy. Whereas optical spectroscopy allows scientists to probe the molecular bonds and atomic electrons of a sample's molecules, acoustic spectroscopy is typically more concerned with the bulk physical properties of the sample medium.
Of the many available particle-size analysis techniques, laser diffraction and acoustic spectroscopy are the most promising for in-process applications.

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