Procedure - Have a partner hold a cotton ball over a small bowl as you slowly drop water into it. Count the drops of water you add to the cotton ball before it starts to drip water out the bottom. Repeat with a new dry cotton ball and see it they hold the same amount of water.
Results - No 2 cotton balls held the same amount of water droplets.
Conclusion - No 2 clouds hold the same amount of water vapour before it starts to rain.



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