注射器是一种相当普通的医疗器械,不仅透明、耐用、有一定的刻度,而且本身还是一个封闭的体系,具有一般化学仪器所不能替代的优点。在运用注射器进行气体化学实验时,不仅能直观地观察到气体体积的变化,而且能有效防止有毒气体对空气的污染。笔 Syringe is a fairly common medical device, not only transparent, durable, with a certain scale, but also a closed system itself, with the general chemical equipment can not be replaced by the advantages. Gas chemical experiments using syringes not only directly observe the change of gas volume, but also effectively prevent the toxic gas from polluting the air. pen