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《小学自然教学》在2000年7—8期刊登了江苏省宿迁市实验小学曹珺同志的《<大气压力>实验材料选择》的文章。该文在选择”覆杯实验”的材料时提到用广口杯、水槽、吹塑纸。笔者认为“吹塑纸”做为盖杯口材料欠妥。因为”吹塑纸” 比较轻,且易附着水,杯子里盛过水后残留的一些水足以将“吹塑纸”粘住。这样,就会出现如下情况:杯中盛满水做“覆杯实验”,吹塑纸不脱落;倒掉水后再用此杯做“覆杯实验”,“吹塑纸”也不脱落。
In “Nature Primary School Teaching” published in the 7-8 issue of 2000, Comrade Cao Jun of Suqian Experimental Primary School in Jiangsu Province published an article entitled “Selection of Experimental Materials for Atmospheric Pressure.” The paper mentions the use of wide beakers, sinks, and blown paper in selecting “overcook experiments.” I believe that “blown paper” as a cup lid material defects. Because “blown paper” is relatively light and easily adheres to water, some water remaining in the cup after it has filled the water is sufficient to hold the “blown paper” in place. In this way, there will be the following situation: cup full of water to do “cup experiment”, blow molding paper does not fall off; pour the water and then use this cup to do “cup experiment”, “blow molding paper” does not fall off.