What Is The Principle Of Automatic Heating Bag

- Jun 01, 2017 -

 Heating Bag What is the principle of automatic heating bags, to understand the principle of automatic heating bags, we must first look at the supersaturated solution.

  At a certain temperature, the solute solubility in the solvent is constant. This solution is called a saturated solution when the concentration in the solution is equal to its standard solubility, and when the concentration of the solution is higher than its saturation solubility in the solution, the solution is called a supersaturated solution. Automatic heating bag inside the liquid is supersaturated solution of sodium acetate (CH3COONa).

  However, the supersaturated solution is an unstable solution which, upon agitation, initiates the crystallization of the solute, which is exothermic.

  Heating Bag When people put a piece of metal inside the supersaturated solution inside, and twist inside the metal sheet produced by the slight vibration (not necessarily the use of metal pieces of shock, with other local stimulus approach can be) enough to make the solute crystallization , Until all the crystals are completed, into a more stable solid. The crystallization process is an exothermic process, which allows the automatic heating bag to release heat.

  The supersaturated solution can be recycled. As long as the bag is heated in boiling water for about a few minutes, the condensed solute will dissolve again; this is due to the increased solubility of the solute at high temperatures. In the process of dissolution, the solute undergoes an endothermic reaction (this absorbed heat, which is used to dissolve the crystal) again becomes a supersaturated solution.

  Self-made automatic heating bag approach:

  1 Place 175 g of sodium acetate (CH3COONa) in a beaker containing 50 mL of water:

  2 dissolve the sodium acetate in the beaker with hot water bath;

  3 pour the solution into a thick plastic bag and add a piece of metal that distorts the shock.

  4 sealed a good pocket.

  To understand the principle of automatic heating bags, first look at the supersaturated solution. At a certain temperature, the solute solubility in the solvent is constant. This solution is called a saturated solution when the concentration in the solution is equal to its standard solubility, and when the concentration of the solution is higher than its saturation solubility in the solution, the solution is called a supersaturated solution. Automatic heating bag inside the liquid is supersaturated solution of sodium acetate (CH3COONa). However, the supersaturated solution is an unstable solution which, upon agitation, initiates the crystallization of the solute, which is exothermic. When people put a piece of metal inside the supersaturated solution inside, and twist inside the metal sheet produced by the slight vibration (not necessarily the use of metal pieces of shock, with other local stimulus approach can be) enough to make the solute crystallization , Until all the crystals are completed, into a more stable solid. The crystallization process is an exothermic process, which allows the automatic heating bag to release heat. The supersaturated solution can be recycled. As long as the bag is heated in boiling water for about a few minutes, the condensed solute will dissolve again; this is due to the increased solubility of the solute at high temperatures. In the process of dissolution, the solute undergoes an endothermic reaction (this absorbed heat, which is used to dissolve the crystal) again becomes a supersaturated solution. Self-made automatic heating bag approach: 1 175g of sodium acetate (CH3COONa) into a beaker containing 50mL water: 2 with a hot tub to dissolve the sodium acetate in the beaker; 3 solution into a thick plastic Soft bag and add a piece of twist ...


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