测定空气中氧气含量的实验改进

On Improvement of the Experiment Measuring the Content of Oxygen in the Air

在测定空气中氧气含量的实验中,在由两个注射器组成的密闭系统中留有25mL空气,给装有细铜丝的玻璃管加热,同时缓慢推动两个注射器活塞,至玻璃管内的铜丝在较长时间内无进一步变化时停止加热,生成黑色固体氧化铜,待冷却至室温,将气体全部推至一个注射器内,观察密闭系统内空气体积变化。

In the experiment measuring the content of oxygen in the air,25mL air are reserved in the closed system composed of two syringes,and a tube with thin copper wire in it is heated,while slowly pushing the two syringe piston,and stop heating when there are no further changes with the copper wire over a long period of time,then it generates black solid copper oxide.After it cools to room temperature,push all the gas into one of the syringes,and observe the change of air volume in the closed system.