嘴里有液体，形成液封，壶内压力升高，会造成嘴内液位升高，根据液位差可以计算壶内的相对压力。你看老式水壶，烧开以后锅盖会叫，就是因为壶内压力高了，气体从锅盖里的口哨里出来了。如果水壶能从壶嘴泄压，那个口哨就不会叫了。
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