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九年义务教育三年制初级中学教科书《化学》全一册P．531实验3－－4］介绍了用氢气流吹肥皂泡的演示实验，以证明氢气密度小于空气密度．该实验采用了一种单球干燥器、尖嘴出气管构成的气泡形成装置；单球干燥器内装有干燥剂．它的不足之处是不易形成气泡，即使形成气泡，气泡
Nine-year compulsory education Three-year junior middle school textbook “Chemistry” 531 Experiment 3 - 4] Demonstration experiments using hydrogen gas to blow soap bubbles are presented to demonstrate that the hydrogen density is less than air density. In this experiment, a bubble forming device consisting of a single-ball dryer and a needle-out nozzle was used. The single-ball dryer was equipped with a desiccant. Its disadvantage is that it is not easy to form bubbles, even if bubbles are formed, bubbles