Piezo effect in metals?

Is the piezo effect only in crystalline substances?

Why does metal, when bent, generate heat?

Is there any change in the resistance of a metal when compressed? Or perhaps a spring (coil type)?


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in article Pb3dc.4481$ snipped-for-privacy@newssvr31.news.prodigy.com, C.Martin at snipped-for-privacy@hotmail.com wrote on 4/7/04 7:56 PM:

Yes. The crystal requires a lack of a center of symmetry.

It is the conversion of mechanical energy into heat.


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