Ponyo’s Heat Tube

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.

顶部密封的玻璃管装满水后竖直放置。 将管子的底端浸入装有水的烧杯中，加热管子中间的一小段区域。 探究并解释水和能观察到的气泡的周期性运动