January 22, 2022, 04:09:10 PM
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Topic: An expanding liquid or gas  (Read 465 times)

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An expanding liquid or gas
« on: December 21, 2021, 06:36:52 PM »

Is there a widely available liquid or gas out there that'd rapidly expand (and subside) upon an "irritation" created by a simple electric circuit? For example, a tiny spark, a voltage change, a magnetic field change etc. Preferably the gas doesn't heat up substantially.


Offline Borek

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Re: An expanding liquid or gas
« Reply #1 on: December 22, 2021, 02:58:31 AM »
None that I am aware of. I do remember reading about polymers that were promising for kind of an "artificial muscle" application - but they were solid.
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Re: An expanding liquid or gas
« Reply #2 on: December 22, 2021, 10:32:45 AM »
Depends on what you mean by "rapid" and the amount of expansion you want. This property in solids is called piezoelectricity - application of mechanical force results in charging (and vice-versa - application of charging results in mechanical force). Because liquids (and certainly gasses) do not respond the same way to mechanical/sheer force as solids, this isn't something you usually associate with liquids and gasses. I believe piezoelectricity has been observed in some liquid crystals, but that may not be what you're looking for.

If electrical discharge causes a gas or liquid to heat, this would result in expansion..
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