找两个耐高温的广口玻璃瓶，配上结实的密封盖，分别在盖上悬挂一个能发出悦耳声音的小铃，并编上瓶号为A，B。实验时，先向两瓶中注入少量水，然后加热A瓶的水。此时密封盖不要盖紧，待水沸腾，水蒸气充满容器，空气大部分被排出后，小心压紧密封盖，水冷却后，瓶内近似真空状 Find two high-temperature-resistant wide-mouth glass jars, accompanied by strong sealing caps, and hung a small bell that can produce pleasing sounds on the caps, and number bottles A and B. During the experiment, first inject a small amount of water into the two bottles and then heat the A bottle of water. At this time, the sealing cap should not be tightly closed until the water boils and the water vapor fills the container. After most of the air is discharged, the sealing cover is carefully pressed. After the water is cooled, the bottle is almost vacuum-like.