Why did the cold water in a double walled glass burst on its own

It's very simple, it means that it is a bad cargo. The real glass should be stressed, that is, it should be poured out immediately after filling the boiling water, and then the ice water should not be broken. What's more, yours also advertises a double-walled glass, which is said to be a high-end glass, and this should not be the case.

Your situation is the most resistant glass in the past, only the most resistant glass will appear, because of the temperature difference stress and break. Look at the condition of the glass after you burst, if it is cracked by nine curves, it means that the stress treatment of annealing technology has not been done, and if it is all blown up. A large pile of obtuse small debris, that means that the temperature of the product is uneven when tempered, resulting in uneven internal stress in the glass.

1. There are many reasons why the cup bursts on its own, it may be the quality of the cup itself, or it may be that the temperature difference between cold and hot in a short period of time is too large, and it is expanded and contracted by heat.

The impact of the burst. Second, the reason for the burst of the glass is mostly because of thermal expansion and contraction, the glass is a poor conductor of heat, used when the temperature is low, after the hot boiled water is poured into the glass, the inner wall of the cup is heated and expanded, and its outer wall can not keep up with the expansion rate of the inner wall due to slow heat transfer, and the uneven heating causes the cup to burst. The correct way to use it is to pour a little hot water into the glass first, and rotate the hot water along the entire cup wall, which can play a buffering role in the thermal expansion and contraction of the cup and prevent the cup from bursting when it is hot.

The glass will burst. Because the drastic temperature change causes the thermal expansion and contraction of the glass, the temperature difference between the inside and outside of the cup wall leads to the inconsistency of the degree of thermal expansion and contraction, causing the glass to burst. Of course, this refers to the alternation of ice water and boiling water.

Alternating hot and cold is the main cause of glass bursting.

That is, when the cup is just cold or cold, immediately pour boiling water into it, and it will burst.

This is the phenomenon that exists in the vast majority of ordinary glasses, if it is tempered and other special treatments, it will not burst, but it is also much higher.

Due to the principle of thermal expansion and cold contraction.

After the glass is filled with hot water, it will expand due to thermal expansion and cold contraction, while after the ruler is put into cold water, the outer wall will shrink due to cold; Previously, the inner wall was still in contact with hot water, and there was no synchronous contraction, and it was still in a state of expansion, and it would be ** under the extrusion of the inner and outer walls.

Since the motion of particles (atoms) in an object changes with temperature, when the temperature rises, the vibration amplitude of the particles increases, causing the object to expand; However, when the temperature drops, the vibration amplitude of the particles decreases, causing the object to shrink. Substances such as water (below 4°C), antimony, bismuth, gallium, and bronze shrink when heated in certain temperature ranges and expand when cold, which is the opposite of the characteristics of ordinary objects.

Because of the principle of thermal expansion and cold contraction, the glass is heated unevenly.

When the glass cup suddenly encounters hot water, the inner layer of the cup is heated and expands obviously, but the outer layer is not heated enough and expands less, so that the temperature difference between the parts of the glass is larger, and due to the reason of thermal expansion and cold contraction, the thermal expansion of each part of the glass is uneven, and when the uneven difference is too large, the glass may be broken.

Glasses are very popular among the public, compared to other cups, glasses do not contain organic chemicals, and are beautiful and elegant, do not produce peculiar smells, and have become people's first choice for safe drinking water. But many people have also had such an experience, after the high-value glass was filled with hot water, it suddenly burst without warning, and the glass chips splashed to the **, causing us harm and catching many people off guard.

Why is it easy for the glass to burst after pouring hot water? Glass is a poor conductor of heat, and it is not easy to conduct heat, so the windows in the home are made of glass, which can play a role in heat insulation, including the cotton clothes we wear in winter, which are poor conductors of heat, so as to keep warm. Metal products such as iron pots for cooking are good conductors of heat, with good thermal conductivity.

The glass can withstand a temperature of more than 800, and the hot water after boiling is less than 100, so the glass is not afraid of high temperatures, even if it is used to hold hot water, it will not soften, and the real reason for the glass to break is that the heating is uneven, simply put, "thermal expansion and cold contraction".

The glass has an inner wall and an outer wall, after the inner side of the glass is exposed to hot water, the temperature of the inner wall increases, and the inner layer of the glass will be heated and expanded, and the volume will become larger, and because the glass is a poor conductor of heat, it takes a long time for the heat of water to be transferred to the outer wall, so the temperature of the outer wall is about the same as the room temperature, and the change is also very small.

It is for this reason that the pressure on the outer glass increases instantaneously, and the glass shatters. In other words, if there is a large temperature difference, the glass will easily explode, and the larger the temperature difference, the easier it will be to damage the glass. Similarly, do not rinse a glass with cold water as soon as it is filled with hot water, as it will also cause the cup to break.

Now we can explain a lot of problems, but the thick glass that looks "strong" is more likely to burst than a thin glass because of the slow heat transfer and large temperature difference, and of course, the bottom of the cup should be thin so that it is not easy to break. In winter, when the outside temperature is low, after pouring hot water into the glass, the temperature difference between the inner and outer walls is also larger than in summer, so the glass in winter appears more "brittle".

The improvement of the production process ensures the quality of the glass. In the past, due to the limitation of the process, the pouring molding method was often used, and the temperature of the glass was not high enough when firing, if there were some solid impurities that could not be melted, there would be greater stress inside the glass after condensation, and it was easy to crack after being put into use, while today's borosilicate glass is generally artificially blown.

An important step in the production of glasses is annealing, because the temperature of glass production is very high, which requires continuous lowering of the temperature to eliminate the stress inside the cup, so that the cup will not be "fried" when it is hot. In the past, the annealing method was batch, but now the continuous annealing method can ensure that the temperature drops evenly, and this key step determines the quality of the glass.

According to the principle of thermal expansion and contraction, the hot glass will shrink rapidly when it encounters cold water, so the water cup will crack.

Because of the principle of thermal expansion and cold contraction, when the glass filled with hot water is put into the cold water sink, the internal temperature of the cup is very high, and suddenly the outside shrinks in cold, and the glass can not withstand it and cracks.

Because hot water will cause thermal expansion inside the cup, and cold water will cause the outer wall of the cup to shrink, the two physical phenomena will cause the cup to crack.

Because of the principle of thermal expansion and cold contraction, the inner side of the cup expands when heated, while the outer side shrinks when it is cold, and the two are cold and hot, causing the cup wall to break, and the thicker the cup, the easier it is to break.

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.

Glass wheel yard rock cup wax royal boiling water may crack. The glass is a cup made of glass, and when you fill the glass with boiling water, you can't pour boiling water into the cup at once, because of the principle of thermal expansion and cold contraction, if you pour boiling water into the glass at once, the glass may crack.

The glass is a cup made of glass, when pouring boiling water from the glass, you should first pour some hot water to let the cup mold close and heat evenly, and then pour boiling water.

If boiling water is poured into the glass at once, due to the principle of thermal expansion and cold contraction, the cup will expand in volume due to sudden heating, which will eventually cause the cup to crack.

When buying glasses, choose clean, transparent and complete glasses, and do not buy glasses with bubbles, impurities or cracks on the walls of the cups, so as not to burst after injecting hot water and affect the use.