为什么要先移除导管再熄灭酒精灯
为什么要先移除导管再熄灭酒精灯
化学人气:797 ℃时间:2019-10-04 07:04:04
优质解答
如果先移开酒精灯,导管内空气变冷,热胀冷缩知道吧!压强减小,小于外界压力,大气压将水压入导管,使本来热的导管突然遇冷,发生炸裂,危险
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