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Why Ice Cubes Float in Water
为什么冰块会浮在水面上
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Ice cubes float because frozen water is less dense.冰块会浮起，因为固态水的密度较小。
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Water expands slightly when it freezes into ice.水结冰时体积会略微膨胀。
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This makes ice lighter than the same volume of liquid water.因此，同体积的冰比液态水更轻。
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Most solids sink, but ice is a special exception.大多数固体会下沉，但冰是个特例。
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Floating ice helps fish survive winter in lakes.漂浮的冰层帮助鱼类在湖中过冬。
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It also insulates the water below from cold air.它还能隔绝下方水体与寒冷空气。
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This natural behavior is vital for Earth’s ecosystems.这种自然特性对地球生态系统至关重要。
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Scientists call this property 'anomalous expansion of water.'科学家称此特性为‘水的反常膨胀’。