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What is the conductivity of Play Doh? Answered

Sparkfun and Make both have squishy circuit recipes but I'd like to know the conductivity... anyone? thanks!

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hydronics (author)2013-07-09

The conductive play doh recipe is fairly ubiquitus:
1-cup water
1-1/2 cups flour
1/4 cup salt
3 tbsp cream of tarter
1 tbsp Vegetable oil
food coloring

I measured the official play doh at 100k/170k (brown/blue color)...

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steveastrouk (author)hydronics2013-07-09

What section and length of Playdoh ? RESISTIVITY is the unit we need to compare it with

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hydronics (author)steveastrouk2013-07-09

based on my initial measurements it varies little based on length... i mean we're not talking about meters but inches...

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steveastrouk (author)hydronics2013-07-09

It has to vary linearly with length, but by the square of the crosssection.

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kelseymh (author)steveastrouk2013-07-10

Steve, I think that assumes that the material has uniform conductivity everywhere (i.e., like a metal wire), which may not be a good assumption for Play-Doh.

If the conduction happens, for example, in more electrolytic "veins" between larger grains or nodules of dry dough, then I you might see subquadratic dependence (e.g., r log(r) instead of r2 for the cross-section).

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steveastrouk (author)kelseymh2013-07-10

True. Interesting to find out, and perhaps try graphite loaded clay !

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Kiteman (author)2013-07-09

I don't think they're using normal play doh...

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