The Powder-Snow Reaction is caused by the material PY, when the standardDistance Parameter is changed to a number less than 0.563. This is because the density of Powder is determined by standardDistance, and Snow seems to provide an attractive force. As the particles get smaller they seem to have less friction, and eventually they start moving on their own.

Isotope 003:09

Isotope 0.563

Video of the reaction in action

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