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为什么天上的云朵是白色的呢？

天空中的云朵主要由水蒸气和微小的水滴组成。当光线穿过云层时，光线遇到水滴会发生散射，而水滴对于不同波长的光具有更强的散射能力。由于白光由多种颜色的光组成，这些不同颜色的光在水滴中被散射后会重新聚集在一起，形成白色。因此，云朵看起来是白色的。

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