十万个为什么·科学阅读30篇（6）
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Why Does Ice Float on Water?
为什么冰能浮在水面上？
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Most solids sink in their own liquid.大多数固体会沉入自身的液体中。
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But ice is special—it is less dense than water.但冰很特殊——它的密度比水小。
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When water freezes, its molecules form open hexagon shapes.水结冰时，分子会形成开放的六边形结构。
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These shapes take up more space.这种结构占据更多空间。
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So ice weighs less per cup than liquid water.因此，同等体积下冰比液态水更轻。
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That’s why it floats easily.所以冰能轻松漂浮。
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This helps fish survive winter under frozen ponds.这有助于鱼类在结冰池塘下过冬。
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Without this, lakes would freeze solid.否则湖泊会完全冻结。