Clouds can be thought of basically as a massive updraft of warm moist air from the surface. As the air rises it cools and expands. The water in the air condenses to form tiny droplets. These droplets are comparable to around the width of a human hair so they’re pretty light individually. This means the continuous updraft from the surface is enough to keep them suspended. However as more warm air rises, it adds more moisture which causes the drops to move around, combining into larger droplets which are eventually too heavy for the updraft to sustain and they fall as rain.
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