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贵刊1998年第1期刊登的梁金创老师“空气中氧成分测定的实验”，颇具创意，读后很受启发。下面针对该文，提出两点看法。1．实验所用烧杯中盛无色澄清的石灰水，若在其中滴加无色酚酝若干，使之成为红色，可能观察效果更好。2．该文中有分析文字“在燃烧过程中，一体积的氧反应
The “Experiment on the Measurement of Oxygen Content in the Air” by Teacher Liang Jinchuang published in the 1st issue of your magazine in 1998 was quite innovative and inspired after reading it. Here are two suggestions for the article. 1. The beaker used in the experiment contained lime water that was colorless and clear. If a few of the colorless phenolphthalein were added to it to make it red, it might have a better observation effect. 2. There is an analytical text in the article "A volume of oxygen in the combustion process