The Q&A Archives: Science Experiment with Water

Question: I am doing a science fair project on what type of water will help plants grow the fastest. My idea is to take rain water, tap water, and spring water and see which makes plants grow fastest. For the project I need advice from a professional. I would like to know what you think so I can compare it to the final results. Any other suggestions about this project would be greatly appreciated.

Answer: I have a feeling that you'll see little or no difference in the growth of your plants. There may be some subtle differences, but because these three types of water are so similar, I'm afraid any differences you find will be the affects of other factors. I suggest you think of an experiment using other, more "drastic" variables. For example, you might water with a saltwater solution, to mimic how plants are affect by road salt spray, or use a vinegar solution, to mimic acid rain. I think you'll get more interesting results, and you'll be able to relate them to real-life situations.

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