The glass is used very frequently in our daily life. Most of them have achieved good effects of heat preservation, heat insulation and sealing. Xiaobian believes that many people will crack the glass when they pour hot liquid into the glass. Then will the reason for this phenomenon be the thickness of the glass material customized by the glass manufacturer? Let’s talk about which kind of thick glass or thin glass is safer when customizing glasses.
When we pour hot water into a glass, not all the walls of the glass are exposed to the hot water at once, but become hot from the inside to the outside. When the hot water is introduced into the glass, the inner wall of the glass expands first. However, due to the time required for heat transfer, the outer wall does not feel the temperature of the hot water in a very short time, so the outer wall does not expand in time, that is, there is a time difference between the internal and external expansion, which leads to the outer wall bearing the huge pressure caused by the expansion of the inner wall, (at this time, the outer wall is equivalent to a pipe, and the objects in the pipe are expanding outward) when the pressure reaches a certain degree, the outer wall cannot bear the pressure, and the glass will explode.
If we have carefully observed the cracked glass, we can find a rule that not only the glass with thick wall, but also the glass with a thick bottom.
To sum up, in order to avoid this situation, we should choose a cup with thin bottom and wall. Because the thinner the glass, the shorter the heat transfer time between the inner and outer walls, the smaller the pressure difference between the inner and outer walls, and can expand almost at the same time, so it will not burst due to uneven heating. On the contrary, the thicker the glass, the longer the heat transfer time and the greater the pressure difference between the inner and outer walls, it will burst due to uneven heating!