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京、津、沪三市中学化学实验研讨会于86年9月22日至24日在天津举行。有代表90余人参加了研讨,共表演了74个实验。这些表演都很精彩,但又各具特色。第一天,研讨会集中安排北京市的实验。代表们看后一致认为效果明显、装置简单、操作容易、时间短、安全可靠、便于推广。如清华附中杨彦华、郑增义表演的“气体分子运动的补充实验”仅用了一支试管、一条滤纸、几滴酚酞试液和滴有浓氨水的脱脂棉团,如图操作。
The Beijing, Tianjin and Shanghai High School Chemistry Experiment Seminar was held in Tianjin from September 22 to 24, 2012. More than 90 people attended the seminar and performed 74 experiments. These performances are wonderful, but they all have their own characteristics. On the first day, the seminar focused on arranging experiments in Beijing. Delegates agreed that the effect is obvious, the device is simple, the operation is easy, the time is short, the safety is reliable, and it is easy to promote. For instance, the “Supplementary Experiment of Gas Molecules” performed by Yang Huanhua and Zheng Zengyi of Tsinghua High School attached only one test tube, one filter paper, a few drops of phenolphthalein test solution and absorbent cotton balls with concentrated ammonia, as shown in the figure.