Why glass cup will be broken with hot water. The reason why the glass bursts is that it expands. As soon as hot water is poured into the glass, the inner wall of the glass gets heated sharply.
If the inside and outside of the cup are heated at the same time in advance and then hot water is poured into the cup, the degree of expansion inside and outside the cup is not so different, and it will not burst.
However, if the glass is very thin, even if hot water is poured into it, the heat will quickly spread to the outside, so that the inside and outside expand at the same time, and the glass is not easy to crack.
In addition, the so-called hard glass and heat-resistant glass are not easy to crack because of the small expansion ratio.
1.First pour a little hot water into the cup and shake it to disperse the heat, so that the inside and outside of the cup are heated evenly, and then pour hot water into the cup, so that the inside and outside expansion of the cup is not so different, it will not burst
2.Choose heat-resistant glasses, because the proportion of thermal expansion is small, the glasses made of them are not easy to crack.
Which kind of glass is more heat-resistant to make cups?
1)High borosilicate glass
It is a kind of special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high transmittance and high chemical stability. Because of its excellent performance, it is widely used in solar energy, chemical industry, pharmaceutical packaging, electric light source, handicrafts and other industries. Its good performance has been widely recognized by all walks of life in the world, especially in the field of solar energy, which has been widely promoted in developed countries such as Germany and the United States.
In fact, toughened glass is a kind of pre-stressed glass. In order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of glass. When the glass bears external force, it first counteracts the surface stress, thus improving the bearing capacity, enhancing the glass's own wind pressure resistance, heat resistance, impact and so on.
Can glass cup put into Refrigerator?
1.Put the glass filled with hot water into the refrigerator, hot water will quickly dissipate heat, compressor will work quickly, if the glass of the water cup is thicker, it will cause uneven heat dissipation, making the water cup burst.
2.Refrigeration chambers, especially bottles, cannot be put in. When liquid changes from liquid to ice, its volume will increase. In a sealed glass bottle, it is very likely that the bottle brace will burst.
3.Because the temperature of the refrigerator freezer is higher than 0 degrees, there is no problem for ordinary glasses to be placed in the refrigerator freezer, as long as it lasts.