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一般來說,降溫後有晶體析出. 大多數物質在水中的溶解度是隨溫度降低而减小,但有些物質的溶解度是隨溫度降低而增大的.
一方面固體太多容易加熱不均勻,導致爆沸、晶體過熱分解等問題,另一方面可以利用餘熱將剩餘水蒸幹.前一個因素是主要原因.
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