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取一个空盐水瓶或无色空酒瓶,用橡皮塞紧塞瓶口使之密闭起来,皮塞中再插一根尖嘴硬管,而且使尖嘴朝瓶内至一半处,管的另一端露出瓶口且连一根胶管,胶管另一端伸入一碗水中,如图1所示。接着用酒精灯或蜡烛给瓶的周围均匀地加热,如图2所示(注意,若加热不均匀,瓶有可能破裂)。这时会看到胶管口有大量的气泡从水中往上冒。保持管口不离开水面,停止对瓶加热,同时将瓶呈倒竖放置,又会看到水沿胶管往上冲由尖嘴处朝瓶内喷射,如图3所示。
Take an empty salt water bottle or colorless empty wine bottle, close it with a rubber stopper to close it, and then insert a sharp pipe with a pointed tip and point it halfway into the bottle, the other end of the tube. Exposed the bottle mouth and connected with a hose, the other end of the hose into a bowl of water, as shown in Figure 1. Next, the surrounding of the bottle is heated evenly with an alcohol lamp or candle, as shown in Fig. 2 (note that if the heating is not uniform, the bottle may break). At this time, you will see a large number of bubbles in the hose nozzle running up from the water. Keep the nozzle from leaving the water surface, stop heating the bottle, and place the bottle upside down. You will see the water rush along the hose and spray from the tip to the bottle, as shown in Figure 3.