Rain's Dirty Little Secret

Raindrops form when water vapor condenses onto microscopic dirt particles in the atmosphere. Water molecules naturally bond but need cooling past the dew point to form stable clusters. However, clusters must reach a critical size of 150 million molecules to grow, which is unlikely without dirt particles. These particles act as catalysts, allowing clusters to start at the critical size, leading to raindrop formation. This process is essential for life on Earth.

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