新买的不锈钢蒸笼，蒸包子时为什么最上面两层蒸不熟？（不管放几层 都是最上面两层蒸不熟）
推荐回答（4个）
可能的原因：
1、火力不足；
2、每层密封太严，蒸汽窜不上去。
你遇到的原因不合常理，你看看下面的一道初中物理题：
蒸包子的笼有好几层，同时开始蒸，是上层的包子先蒸熟，还是下层的包子先熟？
答：上层！理由就是蒸包子是要放水的，而水蒸气是要向上飘的！而且水蒸气是含有更高的能量的——其实温度并没有变，但是涉及到汽化热的问题，吸收了能量。在接触到上层的包子时，先液化放热，再热传递放热，这比下层包子单纯的热传递拥有更高的热效率
你看，是吧！
我想你个原因是 2、每层密封太严，蒸汽窜不上去。
楼上的说法正确。但是上面得有个盖子，这样气体冲到顶层后保温。现在楼主的问题不是这样。不锈钢要比铝散热好，最上面二层不熟。是因为气体是向上冲的。最上面没有个大盖子集全下面的气体。都被不锈钢散发出来。最上面的热度肯定不够。之前你都是用木材蒸笼，加上木容器可以集热。现在你换不锈钢的蒸笼，火力不加大。/上面那层很难熟到心。
可能火候不够,
新买的,应该不存在漏气,
蒸笼的东西,肯定最上层先熟,这个应该不用说了,
还有,你是用不锈钢的,上面是玻璃盖子,蒸汽到盖子会生水,水滴到你包子上面去,包子就会"死"这样就更不容易熟了.
密封性不好可能是主要原因，我们的蒸笼就不会出现这种情况
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