Why does the glass burst? How do you avoid a glass from bursting?

We all know that glasses are our first choice for healthy drinking water. But many people have experienced or seen in the news the scene of hurting people after the glass is scalded and broken by boiling water. So why does the glass get scalded by boiling water?

The glass can be scalded by boiling water due to the uneven expansion of the glass. When hot water enters the cup, the inner and outer walls of the cup cannot be heated at the same time. At first, only the inner wall of the cup is heated, while the outer wall remains in a cooling state, causing the inner wall to expand rapidly, while the outer wall remains in its original state. Therefore, the outside side will be subjected to strong pressure from the inside, and the glass will be shattered.

When warm water is poured into the cup, there is no big difference between the heating of the inner and outer walls of the cup, so there is no strong pressure and the cup does not break. How to prevent the glass from exploding? Teach you a few practical tips1

Wash it with warm water before filling it with boiling water, and then pour boiling water, the temperature difference is not so big, and the cup is not easy to break2Fill a large amount of boiling water first, pour some and start to dip the cup. A small amount of hot water is not enough to make the glass burst, but it will heat the glass.

Pour boiling water again and it won't explode3Put an iron spoon in the cup. When boiling water is poured into the bottom of the glass, before it has time to heat the glass (a bad conductor of heat), the boiling water distributes a portion of the geothermal heat to the metal teaspoon of the good conductor, so that the temperature of the boiling water decreases, and it changes from boiling water to hot water, which does not interfere with the glass.

It is known that thick glasses are more likely to burst due to uneven expansion of the glass. Therefore, when using the glass, the public should first soak the cup in warm water, and then flush the boiling water, or pour a small amount of boiling water first, shake the glass, so that the inner wall of the glass is evenly heated, and then pour it full of boiling water, so that it is not easy to burst. After the glass is filled with hot water, it expands and shrinks due to thermal expansion.

It will expand, and after being put in the refrigerator, the outer wall will shrink due to cold, and at this time, the inner wall is still in contact with hot water, there is no synchronous contraction, and it is still in a state of expansion, and it will be squeezed under the inner and outer walls. In the same way, do not pour boiling water into the glass in a cold environment, as thermal expansion and contraction will also make the glass**.

The glass will be scalded and broken by boiling water, the reason is the uneven expansion of the glass, when the hot water enters the cup, the inner and outer walls of the cup can not be heated at the same time, at first only the inner wall of the cup is heated, and the outer wall is still in a cooling state, resulting in the rapid expansion of the inner wall, while the outer wall remains the same, so the outer side will be subjected to strong pressure on the inner side, and the glass will be broken, and when warm water is poured into the cup, the inner and outer walls of the cup will not be heated very differently, so there will be no strong pressure, and the cup will not break.

The glass bursts because the hot water you pour in is too hot, and the glass will break when the hot and cold alternates, so if you want to avoid the glass from bursting, don't pour too hot water into it.

The glass can be scalded by boiling water due to the uneven expansion of the glass. When using the glass, soak the cup in warm water first, and then flush the boiling water, or pour a small amount of boiling water first, shake the glass, so that the inner wall of the glass is evenly heated, and then pour full of boiling water, so that it is not easy to burst.

Because someone puts a glass filled with hot water into the refrigerator, the glass will burst after the hot expansion and contraction will cool down rapidly, so if you want to avoid the glass from bursting, you need to wait for the hot water to cool before putting the glass in the refrigerator.

Because the force inside and outside the glass is uneven, and the internal heat and external cold lead to explosion, it is necessary to avoid the glass from bursting and pour hot water to neutralize it with cold boiled water to prevent the water temperature from overheating.

Because the glass has poor thermal conductivity, when boiling water is poured into the glass, the inner layer of the glass expands when heated, and the outer layer is not heated, which will generate outward pressure, which will lead to the glass**.

Because the glass is cold, when pouring hot water, the inner wall will expand and contract, if you slowly pour a small amount of hot water, shake the cup, so that the cup is evenly heated inside and out, you can better avoid bursting.

Because in the cold winter, it will burst when it encounters hot water, which is inseparable from its endurance.

Glasses may burst when in use, and common causes include a few points to lose

1.Thermal reaction: If a cold beverage is poured into a hot glass, the glass will undergo a thermal reaction due to the temperature difference, causing it to burst.

2.Physical damage: If there is physical damage such as scratches, cracks, or bumps on the surface of the glass, it is also prone to burst when impacted by external forces.

3.Internal defects: If there are internal defects during the manufacturing process, such as air bubbles or uneven thickness, the glass may also burst during use.

4.Thermal expansion and contraction: If the glass is left with hot or cold water for a long time, the glass will undergo thermal expansion and contraction, and if the situation is more severe, it will lead to explosion.

Therefore, when using glasses, you need to pay attention to the above factors to avoid unnecessary dangers.

1. Use heat-resistant glasses: When we buy, we should choose glasses made of heat-resistant materials, because it has a large thermal expansion rate and is not easy to burst. Buy *** products, buy products that have anti-explosion function by themselves.

2. Put a spoon and put it: Before pouring boiling water, put an iron spoon or stainless steel spoon in the cup, and then slowly pour the boiling water into the cup. When boiling water is poured into the bottom of the cup, the boiling water will distribute part of the heat to the metal teaspoon of the good conductor, so that the temperature of the shinho in the boiling water will be lowered, and there will be no damage to the glass.

3. Let go of the water to boil: If you want to prevent the new glass from breaking, you can put the newly bought glass in the water and boil for 10 minutes. Or you can also put a little hot water to wash the glass before filling it with boiling water, and then pour the hot water so that it will not burst.

4. When using a glass to drink boiling water in winter, don't pour a lot at one time, you can pour a small amount of water first, warm the glass before use, and prevent the temperature difference from being too large and causing it to burst.