科学素养与生活应用·英语30篇（2）
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Why Ice Floats on Water Due to Hydrogen Bonding Expansion
冰为何因氢键扩张而浮于水面？
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When water freezes, hydrogen bonds lock molecules into an open hexagonal lattice structure.水结冰时，氢键将分子锁定成开放的六方晶格结构。
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This arrangement increases volume by about 9%, making ice less dense than liquid water.这种排列使体积增加约9%，导致冰的密度低于液态水。
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Most substances contract when solidifying, but water is uniquely anomalous for this reason.多数物质凝固时会收缩，但水因这一特性而异常独特。
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Floating ice insulates lakes and rivers, allowing aquatic life to survive winter below.漂浮的冰层能为湖泊和河流保温，使水下生物得以在冬季存活。
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Hydrogen bonding causes strong intermolecular attraction that resists compression in solid state.氢键造成强分子间吸引力，使固态冰难以被压缩。
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The density minimum occurs at 4°C, which is why colder water rises toward the surface.水在4°C时密度最大，因此更冷的水反而会上升至水面。
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Engineers design cold-climate infrastructure knowing ice exerts upward pressure on structures.工程师在设计寒区基础设施时，会考虑冰对结构产生的向上压力。
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Oceanographers track freshwater input from melting glaciers using salinity and density profiles.海洋学家通过盐度和密度剖面追踪冰川融化带来的淡水输入。
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Without this property, lakes would freeze solid from bottom up, ending most freshwater ecosystems.若无此特性，湖泊将自底部向上完全冻结，终结大多数淡水生态系统。
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Scientists study ice nucleation to improve cryopreservation techniques for medical tissues.科学家研究冰晶成核过程，以改进医学组织的低温保存技术。