Traditional Culture Encyclopedia - Traditional stories - Why does the bottom of the container explode when it touches the wick of the alcohol lamp when it is heated?

Why does the bottom of the container explode when it touches the wick of the alcohol lamp when it is heated?

The flame of the alcohol lamp is divided into three layers, from the inside out is the center of the flame, the inner flame, the outer flame, the outer flame has the highest temperature, the center of the flame has the lowest temperature.

And containers such as glass test tubes are prone to break when heated unevenly.

The glass touches the wick, where the temperature is low; the outer flame is hot. The bottom of the glass test tube (or container) forms a large temperature difference and blows up.