Science Fair Project Ideas has assembled a vast collection of science fair project ideas written by science teachers, professional scientists, and educational consultants on popular science fair topics ranging from physics and chemistry to biology and even sociology. We offer free science fair ideas suitable for every grade level, be it preschool, kindergarten, elementary school, middle school, or high school. Check the boxes in the sidebar to filter your results, or use the search bar to find that perfect science fair project or experiment your child will be sure to love.

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In this free science fair project idea, we learn the differences between coarse, medium and fine-textured soil.
Middle School
Earth & Space Science
In this free science fair project idea, we demonstrate and analyze the effects of erosion on crustal material.
Middle School
Earth & Space Science
In this science project, you will demonstrate the greenhouse effect and you will discover how materials of the Earth's surface affect the greenhouse effect.
Middle School
High School
In this project, the affect of acid rain is simulated by the acid, vinegar.
Elementary School
Second Grade

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