An oscillatory flow of water is generated when a cup,with a small orifice in its bottom,and filled with saline water,is placed within an out vessel containing distilled water.

• 将盛有盐水溶液、底部有小孔的内套管垂直放入盛有蒸馏水的外套管中,小孔处可以观察到流体上下振荡,这种现象被称为盐水振荡。