Chemistry Question #88

Nick Hiebert, a 23 year old male from the Internet asks on November 14, 1999,

Is there a substance known to science that reacts to electrical impulses by contracting or changing its density?

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The answer

Barry Shell answered on November 14, 1999

There may be many such things. One thing I'm aware of are piezoelectric materials that do this: salts, ceramics, and plastics. The chief polymer used for this is Polyvinylidene Fluoride (PVDF). If you do web searches on this, you will find much info. A good explanation can be found at

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