ANSWERS: 3
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Chemical reaction
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"Actually soap doesn't get foamy - that's an additive just as toothpaste (by itself) isn't necessarily foamy either. The additive tends to react with heat." Source and further information: https://www.answerology.com/index.aspx/question/2556556_-wash-your-hands-.html Further information: http://en.wikipedia.org/wiki/Foaming_agent http://en.wikipedia.org/wiki/Sodium_laureth_sulfate
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I do not know.
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