论文部分内容阅读
普通我们作气体的燃烧实验采用两种方法:一种是用集气瓶(或广口瓶)收集气体,然后在瓶口点火燃烧;可是因为集气瓶内气体有限,燃烧时间太短,对于火焰光辉的强弱,发及某些属于有机化合物的气体如甲烷和乙炔等,燃烧时的油烟多少和有无(分子内含碳的百分数高低)等,不能给学生一个比较长的时间观察,这一点特别是在演示中更容易感觉到。另一种方法是在发生气体的容器的导管末端直接点火燃烧,这种方法的优点是因为气体能
Ordinary gas combustion experiment using two methods: one is the collection of gas bottles (or jars) to collect gas, and then the bottle ignition combustion; but because of gas collection bottle gas is limited, the combustion time is too short, for Flames brilliance, hair and some belong to organic compounds such as methane and acetylene gas, the number and presence of fumes burning (molecular carbon content), can not give students a longer time to observe, This is especially noticeable in presentations. Another approach is to directly ignite the burner at the end of the vessel where the gas is present. The advantage of this approach is that gas