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为什么冰块会浮在水面上呢？

物质的密度是决定物体浮沉的重要因素之一。水在0℃时的密度最大，随着温度的升高密度逐渐降低。而冰是由水分子结冰形成的晶体，冰的密度比水的密度小。所以当冰块进入水中时，由于冰的密度小于水，它会浮在水面上。

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