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Why glass is broken Shuitang

  • Author:Biao
  • Release on :2016-09-14
  Standing health and hygiene point of view, drinking glass is the best tool. But I never thought, cups will become "a tragedy." Many news reports have poured boiling water on broken glass after wounding. In this case, we should get to know some of the causes and prevention methods. Here we learn and this knowledge together.
glass cup
    Differential expansion glass is a glass face began to break the main reason. When the hot water into the cup, the inner and outer walls of the cup can not be simultaneously heated. What started as the cups are heated, and the outer wall remains in a cooled state, leading to the rapid expansion of the inner wall portion and the outer wall but maintain the status quo; it will be outside of the extreme pressure inside the glass breaketh. When hot water is poured into the cup, the cup's outer wall will not heat very different, and therefore do not produce strong pressure, the cup will not rupture.

    Is there no way to prevent it? It was specifically for this problem do the experiment: lay edged teaspoon in a cup to see what will happen when the phenomenon?

    Put a teaspoon in the cup, when water poured into the bottom of the cup when not enough time before the glass with hot (poor conductor of heat), heat a portion of the water will give a good conductor of metal teaspoon, therefore, water temperature reduced it from the boiling water into the hot water, there is nothing to impede the glass. As the water continues to pour into it, the cup is not so terrible, because the cup with hot already had time slightly.

    In addition, to prevent glass breakage, you can also use the glass into the water to boil for 10 minutes, so the glass after uniform heating, no strong pressure, it will not lead to rupture of the cup; or You can also pre-installed water, rinse under hot water to put a little cup, then pour hot water, it also will not burst.

Thick glass thinner than breakable glass

    Many people think that the thicker glass is not easily broken, in fact, this is a misconception. Conversely, when poured into hot water, thick glass is easier to break, but not easy to break the glass and thin. Because the thin outer wall of the cup can be heated quickly, leaving the inside and outside temperature is equal to the expansion and thus uniform; however, a thickness of the outer wall of the cup could not immediately be heated, the temperature difference between the inner and outer walls of the big, uneven expansion and thus, resulting in rupture. However, thin cup thin side wall not only, bottom of the cup must be thin. Because, when poured into hot water is first heated bottom of the cup, bottom of the cup if it is thick, it may also be due to the same reason lead to rupture of the cup.

    From the above description, the thinner glass containers, when subjected to the more hot water is not easily broken. For example, very thin in the cup beaker drainage, heating directly used, it will not break.

    Therefore, to remind everyone in the use of glass to put in a cup of warm water immersed a dip, then red water, or to pour a small amount of boiling water, shaking the glass, so that the inner wall of the glass evenly heated, refilled water, so not prone to burst.