How does seeding work in weather?

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I don’t really understand how seeding works when governments are trying to make sure rain doesn’t happen on particular days. How do they do it, and why does it work?

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For water vapor to condense into clouds and rain drops, the water molecule needs to hit some particle it can condense onto. By putting a ton of these particles in the sky, it makes a ton of water vapor condense and can create rain. Since you took the water vapor out of the air, it makes it harder for that air to rain later on. Basically you can prevent future rain by making it sooner.