13. Ponyo's Heat Tube 波妞的热管

A glass tube with a sealed top is filled with water and mounted vertically. The bottom end of the tube is immersed in a beaker of water and a short segment of the tube is heated. Investigate and explain the periodic motion of the water and any vapour bubbles observed.

将顶部密封的玻璃管灌满水并垂直安装，管子底端浸没在盛有水的烧杯中。对管子的一小段进行加热，研究并解释水和观察到的水蒸气气泡的周期性运动。