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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 form.大多数固体在自身液态中会下沉。
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But ice is special — it is less dense than liquid water.但冰很特别——它的密度比液态水小。
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When water freezes, its molecules form open hexagon shapes.水结冰时，分子会形成敞开的六边形结构。
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These shapes take up more space than moving liquid molecules.这种结构比流动的液态分子占据更多空间。
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So ice weighs less per cup than cold water.因此，同等体积下，冰比冷水更轻。
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That makes ice float like a boat on top.这使得冰像小船一样浮在水面上。
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This protects fish and plants under frozen lakes.从而保护了冰封湖泊下的鱼类和植物。
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If ice sank, lakes would freeze solid in winter.如果冰会下沉，湖泊在冬天就会完全冻实。