好奇为什么 · 4-8 岁

冰为什么浮在水面

水结冰后的小秘密

科普启蒙约 5 分钟4-8 岁中英双语

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厨房里，冰块“扑通”跳进水杯。小雨问：“冰为什么浮在水面？”

In the kitchen, an ice cube plops into a glass. “Why does ice float?” Xiaoyu asks.

厨房里，冰块“扑通”跳进水杯。小雨问：“冰为什么浮在水面？”

In the kitchen, an ice cube plops into a glass. “Why does ice float?” Xiaoyu asks.

妈妈笑着说：“我们先做个冰水实验，看看冰有多少藏在水下。”

Mom smiles. “Let’s do a little ice-and-water experiment and see how much ice hides below the water.”

水里的小分子总在动。结冰时，它们排成较疏松的晶体空架子。

Tiny molecules in water are always moving. As water freezes, they arrange into a more open crystal structure.

所以，同样多的水结成冰，体积变大，密度变小，冰就更容易浮起。

So the same amount of water takes up more space as ice. Ice is less dense, which helps it float.

冰块浮着时，大约九成在水下，只有一小角露在水面上。

When an ice cube floats, about nine-tenths stays underwater, with only a small part above the surface.

湖面也会这样：上层先结冰，冰层像被子，减慢水的散热，保护水下生物。

A lake does this too. The top freezes first, and the ice layer slows heat loss like a blanket, protecting life below.

小雨把冰放进杯里，观察水线：冰大约九成在水下。冰融化后，水面几乎不变。

Xiaoyu watches the waterline: about nine-tenths of the ice is underwater. When it melts, the water level barely changes.

小雨点点头：“疏松结构让冰的密度更小！”她又问：“热气球为什么能飞？”

Xiaoyu nods. “The open structure makes ice less dense!” Then she asks, “Why can a hot-air balloon fly?”

水结冰时结构变得疏松，同样质量占的体积更大，密度比水小，所以冰会浮起。

When water freezes, its structure becomes more open, making ice less dense than liquid water so it floats.

将当前插图、字幕和旁白合成为适合手机分享的竖屏视频。

让孩子走进这个故事

生成一本以孩子为主角的「冰为什么浮在水面」新编绘本，或写下任何一个小心愿，几分钟做成专属中英双语绘本。