In the hot summer, you can do cold treasure, such as using ice bags, anti-deployment cooling, but need to be frozen in the refrigerator before use. In order to understand the "hand warmer" hand warming principle, we first need to understand the supersaturated (supersaturated) solution. At a given temperature, the solution (solution) in the solvent (solvent) solubility remains unchanged, for example, when the room temperature, salt (sodium chloride) solubility of 36g/100mL. If the concentration of the solution is equal to its solubility, it is said to be saturated (saturated) solution; plug in the hot water bag if the solubility value of the solution is higher than its solubility, it is said to be supersaturated solution. saturated solution. The liquid in the hand-warming bag is a supersaturated solution of sodium acetate (sodiumacetate, CH3COONa). Because the concentration of the supersaturated solution is too high, it is unstable. The slight vibration produced when twisting the metal is enough to crystallize the solute into a more stable solid. However, this process is heated (exothermic), hot water bag manufacturer therefore warming bag notice begins to warm up. One advantage of hot tote bags is that they can be recycled. The hot tote is placed in boiling water and heated for about I0 minutes, the condensed solute will redissolve, this is because the solubility of the solute increases at high temperatures. When dissolved, the solute undergoes a heat absorption reaction (endothermicreaction) and once again becomes a supersaturated solution.
The packaging allegedly appears to be made of PVB material, which is non-toxic at room temperature but produces toxic substances when heated. This commodity, quality supervision and inspection and quarantine did not test, safety is to be considered.
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