烧瓶、烧杯、锥形瓶等加热时需垫石棉网,目的是使受热容器受热均匀。为什么垫石棉网就能受热均匀?

来源:百度知道 编辑:UC知道 时间:2024/06/16 05:46:13

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石棉的导热性相当好,相对于玻璃来说要好得多,你在加热的时候垫了石棉网后首先热量迅速在石棉网中传播,使真个石棉网的温度达到一致,这样他再传到玻璃器皿,玻璃器皿受热就是均匀的,如果直接加热那么玻璃器皿受热是从一个点受热再扩散的,受热当然不均了