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Why Does Salt Melt Ice on Roads?
为什么盐能融化道路上的冰？
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Salt lowers the freezing point of water below zero degrees Celsius.盐能降低水的冰点，使其低于0摄氏度。
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Pure water freezes at 0°C, but saltwater freezes at a lower temperature.纯水在0°C结冰，而盐水则在更低温度下结冰。
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When salt touches ice, it makes a brine solution that stays liquid longer.盐接触冰时，会形成盐水溶液，更长时间保持液态。
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This liquid layer breaks the bond between ice crystals.这层液体破坏了冰晶之间的结合力。
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The process works best above -21°C, not in extreme cold.该过程在-21°C以上效果最佳，极寒条件下无效。
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Salt does not heat the ice — it changes its chemistry instead.盐不会加热冰，而是改变其化学性质。
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Other substances like calcium chloride also melt ice safely.氯化钙等其他物质也能安全融冰。
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That’s why roads stay safer during winter storms.因此冬季风暴期间道路更安全。