Hot water can make a glass burst, what are the reasons?

Because the cup is heated unevenly, there is a difference in internal and external pressure, so it will cause the glass to expand by heating, the pressure on the inside and outside is not the same, the thermal conductivity of the cup is not very good, after pouring hot water, the expansion degree inside and outside the cup is not the same, the temperature is not the same, can not be heated at the same time, it will be **, there is also a reason that the quality of the glass is not good, the glass is not an explosion-proof glass, the glass is relatively thin, etc., are affected.

Because the glass is cold, due to the poor thermal conductivity of the glass, if the wall of the cup is very thick, the temperature will not be transferred to the outer wall quickly, causing the inner wall to expand. Cracks will occur under thermal expansion and cold contraction. Thus exploding.

Because the temperature of hot water is relatively high, it may be because the quality of the glass is relatively poor, and there is uneven expansion, so the temperature of the inner wall and the outer wall are completely different, and it will be affected by the pressure.

The main reason is that when the hot water and the cold glass come into contact, a violent chemical reaction will occur, which will cause **.

Because the winter is particularly cold, many people will drink hot water to keep warm. However, if you are in a very cold area, if you pour hot water directly on the glass, the glass will burst. I've also encountered this situation, and I like to make some honey grapefruit tea by myself.

Occasionally, when I took out the glass jar in the refrigerator and poured hot water to clean it, the glass jar suddenly exploded. Today, I'm going to talk to you about why this happens.

Because the temperature in winter is very cold, it is said that the flat body itself is relatively cold, and when the hot water is poured in, there will be thermal expansion and contraction.

phenomenon, will expand rapidly. But if the glass you buy is very thick, then if the temperature is not particularly high, it will not explode in an instant, and it will slowly expand and explode from the mainland, and then the outer layer of glass will also appear.

Regardless of whether it is a thick glass or a thin glass, the cup is very cold in winter, so pouring hot water directly will definitely cause it to burst. In winter, if you want to drink water from a glass, it is recommended that you do not pour particularly hot water first. You can warm the glass with warm water first, so that the hot water will not burst again.

It is very dangerous for the glass to burst, so it is recommended that you pay attention to this situation and pay attention to the temperature of the cup when drinking water in winter. If the temperature is too low, you can't pour particularly hot water, otherwise it will definitely happen. In fact, it's not just the glass, like many people drink cold beer in the summer, and when the cold beer is suddenly taken out, some ** situations will happen, all of which are based on the same principle.

In winter, if you pour hot water into the glass, the glass may burst, which is the phenomenon of thermal expansion and contraction, and the inner layer of the glass expands when heated, causing the glass to burst instantly.

Because glass is a bad conductor, it will expand in heat, so if hot water is poured into it, it will burst.

Because the temperature of the glass is very low, after the hot water is poured suddenly, some qualitative changes will occur, so it will burst.

Because the glass is very cold, hot water is suddenly added, and it is easy to burst when the hot and cold alternates.

We all know the physical phenomenon of "thermal expansion and cold contraction", because glass belongs to a class of hard and brittle materials, so when the glass expands unevenly, it is easy to burst. When we pour boiling water into the glass, the inner wall of the glass heats up quickly and expands, but there are exceptions. I have heard reports of some miscellaneous gas stoves, the surface of the stove is covered with glass, one is good-looking, the other is easy to clean, but when someone cooks something, it is estimated that the quality of this glass panel is not up to par, and it is fried unevenly heated.

Why do glasses that we think we are very familiar with sometimes burst when we use them? In fact, this is just a situation that was prone to occur in the past, and it is rare to hear of bursts of boiling water in the glass used today. Why is that?

Brother HuaIn summer, the temperature of the glass itself should not exceed 30°C. And freshly boiled water has 100°. When hot water enters the cup, the temperature of the inner wall of the cup rises rapidly, while the outer wall is still at room temperature.

At this moment, the inner and outer walls of the cup are subjected to a temperature load with a temperature difference of about 70°.

In the past, the glass will be fried with boiling water, mainly due to the thermal expansion and contraction of the glass, and the current glass material is basically high borosilicate glass, with a small linear expansion coefficient, good high temperature resistance, and it rarely bursts when poured into boiling water like before. These microscopic particles are moving irregularly all the time, but the arrangement between the solid and liquid molecules is relatively close, the distance between each other is smaller, the force between the molecules is relatively large, and the degree of irregular motion is not as obvious as that of gas molecules.

If freshly boiled hot water is suddenly poured into a regular glass, sometimes the thicker glass will burst. This is because the moment the boiling water is poured, the inside of the glass is heated and expanded, and the outer layer of the glass does not expand because of the slow heat conduction, which causes the glass soda-lime glass to rise a lot. Because of this, in the past, when the economy was not developed, soda-lime glass would be very commonly used.

Nowadays, cups are rarely made of soda-lime glass, and the high temperature resistance has been greatly enhanced.

Because the quality of glass at that time was relatively poor, it would burst after encountering cold and heat.

This is because the previous glass was not resistant to high temperatures, and the sudden rise and fall of water temperature was the main cause of glass breakage. Glass also has a high-temperature resistant vertex, and if it exceeds this point, it will be **.

Because of thermal expansion and contraction, the glass is heated unevenly, and it will occur suddenly**. Nowadays, many glasses are made in a double layer, so that they will not be affected. There are also many people who pour a little hot water first, then let the bottom of the glass heat evenly, and then pour more hot water.

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.

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.

01 The glass is cold, when hot water is poured in, the inner wall will expand rapidly due to thermal expansion and contraction; However, because the glass is a poor conductor of heat, if the cup wall is very thick, the temperature will not be transmitted to the outer wall quickly, so the inner wall will expand; But if the outer wall remains in its original state, it will cause the glass to break.

In winter, pouring hot water into a glass Many people will have this experience, as soon as the hot water is poured, the glass bursts. So I can't help but choose to buy the thick glass, is it really the thicker the less likely it is to burst?

The answer is that the thicker the glass, the easier it is to burst.

The glass is cold, and when hot water is poured into it, the inner wall will expand rapidly due to thermal expansion and contraction; However, because the glass is a poor conductor of heat, if the cup wall is very thick, the temperature will not be transmitted to the outer wall quickly, so the inner wall will expand; However, the outer wall remains in its original state, so it will cause the glass to break.

How to avoid a burst accident?

Pour in boiling water slowly and in small amounts, and shake the cup at the same time so that the cup is evenly heated inside and out, so that it can better avoid bursting.