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Why the glass will be open Shui Tang rupture

Standing health and health point of view, the glass is the best tool for drinking water. But never thought that cups will become a "tragedy." Many news reports about the glass after pouring into the water broke the wounding event. In this case, we should understand some of the reasons and prevention methods. The following and everyone to learn this knowledge. 
flower tea kettle
    Uneven expansion of the glass glass is the main reason for the beginning of rupture. When hot water enters the cup, the inner and outer walls of the cup can not be heated at the same time. In the beginning, the inner wall of the cup was heated, while the outer wall remained in the cooling state, causing the inner wall portion to swell rapidly and the outer wall to remain intact; the outer side would be subjected to a strong internal pressure to break the glass. When the warm water into the cup, the cup inside and outside the wall will not be very different heat, it will not produce a strong pressure, the cup will not rupture.

    Is there no way to prevent it? Some people specifically for this problem to do the experiment: in the cup placed a teaspoon to see how the phenomenon will occur? 

Hotel  kettle

    Put a teaspoon in the cup, when the water poured into the bottom of the cup when the glass has not had time to hot (hot bad conductor) before the water will be part of the heat to the good conductor of the metal teaspoon, The temperature is reduced, it is boiling from boiling water into the hot water, the glass is no hindrance. As to continue pouring into the water, for the cup has not so terrible, because the cup has been too hot in a moment.

    In addition, to prevent the glass rupture, you can also put the glass into the water to boil for 10 minutes, so after the glass is heated evenly, will not produce strong pressure, it will not lead to the cup rupture; Can also be installed before the water, put a little hot water before the cup under the rinse, and then pour the hot water when it will not burst.
soup kettle
A thick glass is easier to crack than a thin glass

    Many people think that thicker glass is not easy to break, in fact, this is the wrong idea. Conversely, when pouring hot water, thick cups are easier to break, while thin cups are not easily broken. Since the outer wall of the thin cup can be quickly heated to equalize the internal and external temperatures, the expansion is thus uniform; however, the outer wall of the thick cup can not be heated immediately, so that the temperature difference between the inner and outer walls is large and the expansion is therefore nonuniform resulting in rupture. However, the thin cup only thin side wall is not, the bottom of the cup must also be thin. Because, when pouring into the hot water, the first is heated cup bottom, if the bottom is very thick, may also cause the same reason for the cup rupture. 
glass  kettle

    As can be seen from the above description, the thinner the glass container, to withstand hot water when the more difficult to break. Such as a very thin beaker in the cup of water, directly brought to heat, it will not rupture.

    Therefore, to remind you that the use of glass in the first cup in a dip in the warm water, and then red water, or pour a small amount of boiling water, shaking the glass, the glass wall evenly heated, and then poured over boiling water, so that Not prone to burst.