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Why Raindrops Are Round but Not Perfect Spheres
为什么雨滴是圆形但不是完美的球体
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Raindrops start as tiny round droplets high in clouds.雨滴最初是云层高处微小的球形水滴。
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Air pushes against them as they fall, flattening the bottom.下落时，空气阻力将其底部压平。
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Small drops stay nearly spherical, but big ones look like jellyfish.小水滴基本保持球形，而大水滴则形似水母。
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Surface tension pulls water inward, shaping its smooth surface.表面张力将水分子向内拉，形成光滑表面。
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Wind and collisions change drop shape before they hit the ground.风力和碰撞会在雨滴落地前改变其形状。
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Scientists photograph falling raindrops using high-speed cameras.科学家用高速相机拍摄下落的雨滴。
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Drop shape affects how rain soaks into soil or runs off roofs.雨滴形状影响雨水渗入土壤或从屋顶流走的方式。
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This knowledge helps improve weather models and flood warnings.这些知识有助于改进天气模型和洪水预警。