Supersaturated solution is in a situation of disequilibrium, is unstable, if subjected to vibration or add the amount of material concentration of crystals, the solution of excess material concentration will be precipitated and become a saturated state solution, that is, converted to a stable state. However, the purchase of electric hot water bags this process is heat absorption, so when the sodium acetate crystals precipitate, hot water bags gradually warm out.
When the solution is completely exothermic reaction, just put it in the battery charge heating for a few minutes, the solution of water-filled hot water bags to carry out the precipitation of sodium acetate crystals will again melt (the solubility of sodium acetate with the rise in temperature), in the case of dissolution, the amount of material concentration will absorb heat again into a supersaturated solution. This repeatedly, the electric water heating bag will be able to continue to be heated and then exothermic reaction, repeatedly used.
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