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做“空气中氧气含量的测定”实验时,如果没有玻璃钟罩,可用如右图所示装置.该装置的优点是实验现象明显,“形成负压,引水流入”的现象同学们能够亲眼看见.但用该装置做实验时,有时水流入的体积达不到广口瓶的1/5,实验误差(error)较大.下面谈谈如何减少误差,成功做好实验的问题.
In the experiment of “determining the oxygen content in the air”, if there is no glass bell, the device shown in the right figure can be used. The advantage of this device is that the experimental phenomenon is obvious. The phenomenon of “formation of negative pressure and water diversion” can be seen by students. However, when using this device as an experiment, sometimes the volume of water inflow does not reach 1/5 of the jar, and the experimental error (error) is relatively large. Here to talk about how to reduce the error and successfully do experiments.