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Low density happens when the weather is warm. It causes the air particles to spread out and to move faster.
High density happens when the air is cold. The air particles slow down and move closer together.
When water evaporates it becomes water vapor. When air is warmer it holds more water vapor. As the water vapor rises they start to cool down.
The next step is supersaturation. This is when the water vapor returns to a liquid or solid form.
The water droplets form by combining with other things in the air, such as dust, pollution, and sea salt.
All of the tiny water droplets form to make clouds.
Water droplets combine with other water droplets. They get heavy and fall from the sky.