How come ice cream is soft when frozen but after you melt it and freeze it, it becomes ice.
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Ice cream is made by mixing (churning) it as it freezes, so it’s full of little air bubbles. It’s frozen foam, more or less (it roughly doubles in volume during the process).
When you melt it, most of the bubbles collapse, and if you freeze it again without the air bubbles to make it soft, it freezes hard.
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