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A phase transition is a change in the nature of a phase or in the number of phases of a system as a result of a change in the external conditions. Examples: melting/freezing, vaporization/condensation, ferromagnetic transition, superconducting transition.
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What is the physics of the Borax method?
One can add borax to a gold sand then heat it up until it melts and then just let it cool to grab the pure gold. This is just strange. How is borax lower the melting point of something it only touches …