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例1 在“氧气的制取和性质”实验中,某同学取一段纱窗上的细铁丝,在自己收集到的氧气中做“铁丝在氧气中燃烧”的实验.结果没有观察到“火星四射”的现象,请分析此实验失败的一种可能原因.
Example 1 In the “Preparation and Properties of Oxygen” experiment, a classmate took a piece of fine iron wire on a screen window and did the experiment of “iron wire burning in oxygen” in oxygen collected by himself. The result did not observe “Mars. "The phenomenon, please analyze one possible reason for the failure of this experiment.