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For clouds to form, you need several things:

1. Water vapour in the air

2. Falling temperatures

3. Condensation nuclei: tiny little particles of soot, ocean salt, dust

Warm air holds water vapour much better than cold air does. Cold, humid air can't hold as much water as it could when it was warm. So, if you have a bunch of warm, humid air, and temperatures fall, the water vapour in the air turns back into tiny little droplets of liquid water. This is called condensation. But in order to form a cloud, the droplets need something to condense on,which is why condensation nuclei are necessary.

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